How to Install Forge mods as of 1.6:So lately I've been asked by friends, "Matt, how do you install mods to your Minecraft on 1.6?". And I normally tell them these following easy steps:

1). First, you will need FML (Forge Mod Loader) Obviously. To get the download, Go here: http://files.minecraftforge.net/
2). At the link, go to the most recent version of FML, and click, "(Installer)", for using the new installer is much easier.
3). Make sure you download it as an application, with '.exe' on the end. If this can't be done, just right-click the file, hit open with, then select Java SE Binary.
4). When it opens, select the client, and continue. Forge is now installed on your minecraft!
5). Download the mod that you wish to install, and copy it.
6). Next, you will need to find your Minecraft directory. To find this on Windows 7/Vista, click start, type in "%appdata%" hit enter, then click roaming, then .minecraft. You are at your directory! On Windows 8, put your mouse in the bottom-right corner of your screen, go up to Search, then type %appdata% and so on.
7). From here, if there is not already a folder named "mods", create a folder in the directory, and name it "mods", exactly as it's spelled, and no caps.
8). Open up your mods folder, and in it, right-click anywhere and hit, "Paste". Your mod should now be in the mods folder.
9). Open up your Minecraft, and under versions, select "Forge", not 1.6.2.
10). Run Minecraft, AND ENJOY YOUR FRIGGIN' MOD!

If this didn't work, please let me now, and I will try to help. Thanks!