taken from pl
on pornolab you need at least a 0.3 ratio to download stuff,(ratio is total amount uploaded per account/total amount downloaded per account)
e.g. you just downloaded a 9GB file, you need to upload at least 3GB to other people to have a 0.3 ratio (3/9=0.3 basic math)
in order to upload simply leave the client open in the background and when someone will try to download it you will upload