OK, so i originally downloaded a theme and then swapped out my own graphic and changed the colors etc etc.
It was pointed out to me that the theme i chose doesn't allow for anyone to post once they have been assigned a username and password, they can only reply to posts that have originated with me. I would like to change it so that anyone can obtain a username and password upon my permission and be able to post their own stories etc etc.
How do I change this? I'm a noob and not a web designer so talk to me like I don't know anything (because i dont).
Also, if I want to upgrade WordPress, will that cancel out any customization I have done to my blog?