I'm trying to install pixlemon in minecraft but I have no clue how to

Mods like pixelmon need a mod program to work properly; like forge or MCpatcher. I personally use forge on windows 7 so I'll explain how to install it that way.

1. Install Forge
2. Create Forge Profile for Minecraft
3. Have windows show hidden files
4. Open your <username> file: (Mine is Katherine, usually located at the top right of the start menu.)
5. Open Appdata
6. Open Roaming
7. Open.minecraft
8. Look for a Mods folder, if it doesn't exist already, make one
9. Download pixelmon
10. Drag the compressed file for pixelmon into the Mods folder for minecraft; DO NOT EXTRACT!
11. Run minecraft and enjoy

If that doesn't work then something was installed incorrectly or you're running the wrong version of Minecraft for the mod you downloaded. If the mod is for an older version of minecraft run your forge profile in compatibility mode for the older version. To do this do:

1. Run the Minecraft Launcher
2. Select the forge profile and click edit profile
3. In the middle box titled "Version Selection" at the very bottom there's a dropbox menu labeled use version: …
4. Select the version of minecraft required for the mod
5. Save profile and enjoy