Alright now, This is kindly hard to do because all the mod's have to be modify the theme to get the mod's to work's right. All the mod's work right with the "Default theme".
How to install an mod into your forum. Go to any of SMF or TP site have mod's. Make sure you get the right version of the mod. So if you have Current SMF version: SMF 1.1 RC3 for your forum you have to get that version of the mod if you don't have the right version it can miss up your forum or crush your forum. All the mod's come into an zip file. Don't unzip them at all to install them.
Well if you don't know what kind of version you are using on your forum. On the far right you will see Support Information. That will tell you what kind of version you are using for your forum. After you log into your Admin panel.
Any mod can miss up or crush your forum. Make sure you do the backup's for your site and database before you install an mod or any at all.
After you get the mod you wanted for your forum. Download that mod on your computer. After you done that goto your forum and log into your Admin panel.
You will see MAIN under few down you will see Packages. Hit the Packages. It's will put you at this page...

Go over to Download Packages. Hit Browse and found that mod.
Here what it's look like
Before

After

Hit upload
It's will say Package uploaded successfully.
Package has been downloaded successfully
"Your Mod"
That is how to install an mod for your forum!