Welcome - I am not the most computer literate (being of a certain age possibly common to others on here) - the hardest part when I started on here was posting pictures (there's are plenty of guides on here how to do that) there isn't too much more than what you've already managed by becoming a member and posting a new thread
Shows how far I've come, using terms like "posting" and "thread" - when I was a kid "posting" meant you had to go to the end of the street to the post box and "thread" was for sewing
The one I didn't know for ages was the little red square by your username when you log in which is a notification that someone has reacted to a post by you (if you hover over it, it will tell you who/what)
(Hover - Ha! another one for computer lingo-bingo)
It's not rocket science....only brain surgery