ok so I'm trying to update my forge and I downloaded and installed it but whenever I'm on the forge profile I cant change it to 1.7.2. I tried 1.7.2-latest and 1.7.2 recommended and neither worked. Anyone got any ideas?

I'm not sure what you mean, you mean you can't install it?

 

Well, I hope you have read the tutorial.

http://www.minecraftforge.net/forum/index.php/topic,14048.0.html

The new Minecraft loader is pretty sophisticated piece of software (compared to the original) and it was designed to give flexibility to users who like to try out versions, mods, and options. You need to learn what the edit profile page does and how to use it, then you'll know how to select minecraft and forge versions.