Hey, sorry if this is totally the wrong place to post this, but I'm trying to understand this site and I'm hoping for guidance. I didn't see any proper place to post these questions...

I tried uploading an image in a thread and it didn't work. Any reason for that? I haven't seen anyplace to log in for this site so I assume that its a place where you don't need to? (I don't go on forums so, I'm a n00b :/ )

I really like this community and want to participate, so, guidance plz? (What is the password section at the bottom? Do I need a password?)

Yeah, I'm lost. Help!