As nice as a tool that does everything for you may sounds , it is recommended that you know everything manually first , before using such a tool , or you're never going to improve your skills.
what is the purpose of uploader on the shell list..? and how to use it..?
Uploader's are normally (to my knowledge) used to circumvent any protection the server/site has in place to stop you uploading php shells directly. For use i'd wait for Xinapse to reply, he's the dogs knackers with web application security. I think it'll be much the same as including/uploading a normal shell except it won't be detected as easily allowing you to upload your malicious shell from it.
Might aswell remove the Exploit Scanner because its died I think Google changed something on there site that the program uses to search on google for I had this program on my site and it was reported not working so i tested it and its not able to search google for exploits.