I use print screen its the only one that works on my pc, and I found where my screenshots are on my pc, but when I go to the pic manager they dont show up, so im not sure what im missing.
Pic manager only works for screenshots taken with steam overlay, which is the F12 key.
If that's not working for you, have you disabled steam community or steam overlay for skyrim?
Like in a post above, steam screenshots are in really random folders located in your steam directory and can be a pain to find. The best way (when using f12) is open your screenshot manager for steam, click a screenshot, and click the button Open on Disc(or windows explorer, can't remember exactly what it says). This will open the folder where they are.