Let me start off by saying that I'm not exactly and expert on running a website (I just learned the ropes a few months ago), and I'm more or less the caretaker, performing simple functions, posting, and editing.
Today, I was trying to edit my functions.php file to include a line that would allow me to have preset text in new posts (Justin Tadlock's). Seemed easy enough. I put it at the end of my functions.php file and hit update. Then I got white screen. I then hit the back button, and removed the line I just added, then hit update again. Still white screen. Now, I'm not able to access my site at all.
I've looked up the support tickets on this issue, but I just don't understand a lot of what is being said. I assume it's written for people with more experience with said issues, but I have very limited expereince with this. I tried downloading phpMyadmin, but I haven't a clue on how to use it. I just get a bunch of files. FileZilla is also giving me no luck, as my login authentication failed and I don't know where to go from there.
If someone could please give me some help, point me in the right direction, or perhaps simplify instructions on what I need to do, I'd greatly appreciate it. I can provide what FileZilla says when I try to login, or give more detailed explanations of what I did if you'd like.