i'm trying to add the gallery module to my site, but i'm not sure how to. I've tried installing it on the File Upload>Install Module screen. And i get this error "Invalid File Extension For Custom Module Gallery.dnn", since this isn't a module that is part of the core, do i have to upload any files? how would i go about adding this?

Thanks

so i upload everything i unzipped to my server?

There are 2 ways to install module, but with both ways you just need to download the zip.  The easiest way to install a single module is:

-- Login as host
-- Go to the module definitions page
-- Click Install Module
-- Browse to where the zip file is and select the module you want to install.
-- Click Save File.

The program will unzip the file and do the rest of the install for you.