@genuineporcelain The little circle with a + in the middle of it, is what you have to select to invite people. Then you just paste their address into the appropriate spot, etc.
And welcome to here. Wherever we are. To actually follow someone you haven't invited, you go to their page and click the Friend button. I think. :)
If you want to upload a photo, you click on the two squares below a post box.
The little ----> at the bottom of a comment box is how one actually posts.