Make sure you go to mod.learntomod.com and click the green square. Then, press the start server button to get a temporary 10 to 15 minute ip. After 10-15 minutes, just press start server again to get a new ip.
Then, make sure you're using the right minecraft profile. If 1.9 isn't working, try 1.9.2. Here's how to create a minecraft profile: http://forum.learntomod.com/t/use-minecraft-1-9-2-w-new-ltm-servers-heres-how/3054
(If those instructions don't make sense, then most likely you're not using the right kind of minecraft -- it needs to be the laptop / desktop minecraft for mac or windows only, downloaded from minecraft.net -- the paid version)
Then login to your minecraft launcher, press the play button, multiplayer, then enter the ip.
Let me know if that didn't solve it.