You don't upload the folder itself to your uploads folder, you upload everything in the folder to the named directories.
So for example in the upload folder you'll find admin > applications_addon > IPS > ipchat.
Take the ipchat folder and upload via FTP into your forum's admin (whatever you named your admin directory) > applications_addon > IPS.
If you upload everything to right place, when you navigate to Manage Applications and Modules, the uninstalled application will appear in a list at the bottom with an install link next to it. Just hit that and away you go.