The installation instructions are the same as most other MineCraft mods, but for completeness, full instructions have been included.

Windows

1. Open up %appdata%, if you don’t know how to do this, start>run, then type in %appdata%
2. Browse to .minecraft/bin
3. Open up minecraft.jar with WinRAR or 7zip.
4. Drag and drop the necessary files into the jar.
5. IMPORTANT: Delete the META-INF folder in the jar.
6. Run Minecraft, enjoy!

Macintosh

1. Go to Applications>Utilities and open terminal.
2. Type in the following, line by line:

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cd ~
        mkdir mctmp
        cd mctmp
        jar xf ~/Library/Application\ Support/minecraft/bin/minecraft.jar

1. Outside of terminal, copy all the files and folders into the mctmp directory.
2. Back inside terminal, type in the following:

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rm META-INF/MOJANG_C.*
        jar uf ~/Library/Application\ Support/minecraft/bin/minecraft.jar ./
        cd ..
        rm -rf mctmp

1. Run Minecraft, enjoy!

Instructions taken from MineCraft Forum: Risugami’s Mods Installation Instructions