1. Go to any rapidleech plugmod site like http://184.108.40.206/rapid/index.php
then paste ur link you want to remote upload and click on transload.
2. Then it will leech ur link (It Must Be direct link not the fileserve or filesonic if the site doesnot support premium) better use direct link.
3. Then click on back and check your file in the tab SERVER FILES.
4. Then select your file and click on upload.
5. Now select mediafire from the list.
6. Then enter ur username password
7. WAIT TILL YOUR FILE TO BE UPLOADED
8. ALL DONE.