Installing Gradients

HELP!!

Okay, i need help... i downloaded a pack of gradients from crumblingwalls's Livejournal. the thing is....
Now i need to know how to install them >.> and i dont.
I looked through the memories but failed badly at finding something to help me >_>
So, could any of you please point me in the right direction or tell me how to install them?

thanks in advance!