Nikon D3200 settings problems?

I just got my first DSLR, it's a Nikon D3200 and I am extremely happy with it, but I am having issues with ISO, aperture and focus settings. Before, I could change the ISO all the time by holding in the "Fn" button the side and scroll on the wheel to the right, but now that doesn't work. Aperture I haven't figured out how to use, it says that I should click the +- button on the top right and scroll the wheel, but nothing happens. The third problem I have is my focus settings, yesterday I could just switch between auto and manual by clicking the info button, but the option for focus is greyed out.

What am I doing wrong here?

P.S. Keep in mind that this is my first DSLR like I said so I'm more or less clueless when it comes to these types of technical aspects of photography.

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Is the Sigma 50-150mm good for traveling?

are those lens any good for traveling photography?

I own a Nikon D7100.

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Does the tokina AT-X 16-28mm work on a DX format Nikon?

I own a Nikon D7100. The Tokina lens is intended for FX Nikon cameras. I was wondering it if would still be able to work with a DX format Nikon without the vignetting. Also. What would the focal length be when mounted to a DX camera?

Thank You!

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Camera with no viewfinder?

So I recently have started to make YouTube videos on YouTube and I use a Nikon L320. Which has no view finder and I use a small mirror behind it to help me out except I have to look over the camera a lot to check if its still recording or if I'm still on frame. Do any if you know how to make a mirror work as a viewfinder? Like how to set it up? How many I need? Or anything! I can't afford to buy a canon rebel t3i yet so that's a mono! I will not say my channel yet. But I will soon:)

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GPS device for my Nikon D3100?

Hello, I am looking for a GPS device or attachment for my camera that includes the latitude and longitude, and altitude. I wish to have coordinates for when I leave my normal places of shooting on my metadata so I will know where I was. I am aware there are some by Nikon but the one I saw had not so great reviews. What should I get?

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What camera to get next? Upgrade from D5100?

Hi, I am an amateur photographer. I bought my Nikon D5100 about a year and a half ago and I think I am outgrowing it and I want to move up to a better camera. I do work professionally in photography so the quality is mattering more and more with each job. I want a new Nikon camera with a more impressive ability to shoot in low light situations as well as greater megapixel. I understand that lenses are a big factor as well. So I just want help picking a camera.

I am willing to spend about $2000 total. However, I want to use some of that on a nice lens. So a camera costing under $1400 would be nice. I am considering the D7100, D610, and D800. I would love to get the D7100 because I can buy it right now. It's about $700 refurbished and I have that. But if I wait about three months, I can afford the D610 or D800. So my question is, is the D610 a whole lot better than the D7100? Worth the wait? And is the D800 way better than the D610?
Can I use my current lenses on those? I have a 50mm f1.8 and an 18-55mm VR. Last question, what is a really nice overall lens that would go with one of those models? I predominantly shoot portraits, family photos, and conceptual art work.

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Nikon D3100 lens compatibility from other brands?

Hello. I have a NIkon D3100 camera and I am looking for new lenses. I only have an 18-55mm (AF-S DX NIKKOR 18-55mm f/3.5-5.6G VR lens) and I am looking for something up to 200 mm. Preferably beginning with 55mm. I am no expert as I am only a beginner and I am beginning to love this hobby. My question is how do I choose a compatible lens for my DSLR? I am not set on staying with Nikon's Nikkor lenses as I do not want to be restricted to choose if I can actually look for other brand lenses. I am not looking for Nikkor lenses compatible with my camera. Is there some red flag I should look out for If i buy other brand lenses? I am also looking for a lens/lenses that is not muy caro (expensive). Thank you very much, your help is appreciated
Added (1). Also, I prefer manual focus

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