when you make a torrent, make sure to put in the tracker addy you want to upload it on. from there just upload the torrent file to the tracker, sometimes you'll have to redownload the torrent file from their site, it'll check the data, and you should then be seeding.
if you're uploading to etree, they have directions on what to do under the "upload" menu. i bet those will help you out with more detail.