As for sliding boxes I think they mean the moving photos Kiki. ^^''
(I'm not sure how to put code in a forum post)
To do the moving boxes like
this
Just do
[move]Insert a text here[/move]
Proboards uses coding which allows for threading, plotting, and character biography templates that you can edit while creating a post. I personally get mine from here: http://adoxographyv2.boards.net/
You'll have to create an account, but it's a proboards site so it's quick and easy. To find the templates you want, scroll down to "Templates". There you'll find templates for Applications (these are your character biography templates) with already titled boxes and whatnot. If you want blank templates that you can fill out with whatever you want, go to the "Threading" sub-board. :) Hope that's what you're looking for!