First it has to be in a .zip file. Do that then go to advanced reply scroll down and press the manage attachments button.
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download the program winzip, or on your computer it may be called .rar which is automatically on your comp. now just right click the file and click where it says compress to rar or something along the lines
Quote by _InsanitY_
ok thanks but how do i make it be in a .zip file?

Go File > New > Compressed Folder.

It'll make a zip file, which you can drag and drop the GP file into. Then upload that.
Populus vult decipi. Decipiatur.

Quote by Mistress_Ibanez
It's can be a contraction and genitive case.

Quote by Mistress_Ibanez
If you cut down on these costs students won't learn so well, effecting the "quality"...