iOS 7 on iPhone

I was actually doing a Halloween blog post before but it kept getting deleted. I couldn't remember everything I wrote so I  decided not to do it. I mean Halloween already past and it wasn't that special. So first, I want to say I know I am late for downloading the iOS 7. It came out a long time ago but I just downloaded it yesterday. Now, why is it that? Well, for a long time I was too lazy to delete apps, photos, music, etc. on my phone. I literally only had a teeny memory. I didn't even have gb left I only had mb. My problem is that I download too many apps and I have too many pictures. I do like the update. At first, I didn't really like it and it was pretty confusing. But now I do like it. I like the look and everything. I have a few problems on my iPhone though. These problem occured way before I downloaded iOS 7. I can't log into FaceTime or iMessage! It's so annoying! My Apple ID works though because I use it when I buy apps. I can't use my Apple ID or phone number for FaceTime and iMessage. Some message pops up. Another problem I have it's not with the iPhone it's with the app Instagram. I can't post videos on Instagram. And I really want to! It always says failed. Then, I try again and it says the same thing. I don't know how to fix any of these problems. If anybody can help me I would be very glad. :)