First you have to install Minecraft Forge, which can be found here. Download the installer for your version and run it. Then, download the zip file for this mod for the same version, and put it in %appdata%/.minecraft/mods (If you don't know how to get to %appdata%, you can simply open a Run dialog and type it there). Once Forge is installed and the mod is in the mods folder, it should be installed properly and you can play. Have fun!
I like the idea. One thing that would make it cooler is if it was like the freerunner mod. Of course, then this would no longer be the Wall Jump mod. It's so sad that no one's ever managed to remake that mod. I suppose this will do for now. Keep up the good work!
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Don't be surprised if one day I take over the front page of the Forum Games, and then disappear for months at a time. It happens.
I've been doing some testing with 1.8 Forge, and most of it is alright, but sadly a lot of Forge isn't yet updated (that's a lot of code to update!) and so I think I may have to wait until the update for Forge for 1.8 is stable.