how do i install these themes again?
also try making a reddit-themed thingy i guess
Some themes are available through Stylish, however to add most of these themes you need to.
Right click Stylish (linked in OP if you don't have it installed.)
click "create new theme for this site". (make sure it's for forum.blockland.us)
copy the style text from any of the themes you've downloaded.
paste the text in the main box.
name the theme anything you like in the title box.
and the theme should now be active.