1. go to start menu What you need:

Winrar Archiver
2. type %appdata% The mod you want
And epicness
3. click on .minecraft

4. go to bin

5. right click minecraft.jar AKA minecraft

6. go to open with

7. click on winrar archiver

8. Delete META-INF

9. open mod folder

10. select all folders in mod folder except for the "..." folder

11. Drag all the files into the minecraft folder

12. open minecraft and have fun!

How To Install Mods On Mac:
1. Go to finder
2. Click on Home, Library, Application Support, minecraft
3. Open bin
4. Go to minecraft.jar, and right click it
5. Click on open with.. Archive Utility, then delete the original minecraft.jar and then rename the minecraft file to minecraft.jar
6.And Once Opened Drag in the .class files and if needed the folders (Tip: If there's a folder named armor, art, mob, ect. drag the files from there to the corresponding file in minecraft.jar
7. Test Minecraft