Open the Minecraft launcher on your computer, being sure to use a 1.9 or 1.9.2 profile. 

Now, go back to the LearnToMod website. You'll need to complete the Sever Admin page instead of the Minecraft connect badge, each time you want to use our Minecraft servers.

To get there, click the green square on the LearnToMod homepage:

There's a tutorial Steve button on this page, that should show you a video. To summarize, press the start server button and then you'll be given a temporary 10 - 15 minute IP. 

Then, log into the Minecraft, select play, multiplayer then direct connect and enter the IP.

After you're in your world, you can press the mod button and mods should load.

After 10 or 15 minutes, press start server again to get a new ip.