I try posting pictures and I won't let me. Or try looking at other peoples and it doesn't let me now I can't even find option to do it. And last I can figure out how to update my bio and stuff. Can I not do it on my iPhone?
You should be able to do these things via the mobile app. Have you updated the installation recently? If not you might try uninstalling cycling your phone off and on and then reinstalling. Seems to fix most issues