Oh it's simple tc.
Once you're done exporting your skin in bodyshop, go into your
Saved sims folder which should be in the
My Documents/EA Games folder. Open your
Saved sims folder then find the name of the file. Should be the same as what you named it in bodyshop just with a few extra numbers/letters before the name. For example if you named it
TM GlossySkin it will looks like
1e44rgtt6_TM GlossySkin in your Saved sims folder. Now Copy that file and paste it in some other folder. It can be any folder other than the
Saved sims one. Paste it and then right click on the file to
Winrar it or
Winzip it then just upload it to a site like
Mediafire or Box.net.