-------------------------------Windows--------------------------------
Need-
- WinRar [ Register or Signin to view external links. ] (TRIAL)
or
- 7-zip [ Register or Signin to view external links. ] (FREE)
- Brain

Recommended-
- MAKE BACKUP OF .minecraft



- You will need to get the minecraft launcher version (not 'Play in Browser'), Run.
- Login, let it install Packages (.jars), and close.
- Go to Start
- Locate Search Bar (below 'All Programs') or if on Windows XP locate 'Run' (above 'Shut Down' button)
- Type - %appdata%
- Press 'Enter'
- Locate and open '.minecraft'
- go to 'bin', right click minecraft(.jar) look for '7-Zip' click 'open archive' or look for anything saying 'open archive'
- you should see lots of files, delete 'META INF'
- go to [ Register or Signin to view external links. ]
- scroll down till you find 'modloader' then click 'direct' it should download, if not use other link.
- once downloaded open with same method as minecraft.jar
- drag contents of 'modloader' into 'minecraft.jar'
- NOW USE SAME METHOD FOR OTHER MODS
- if mods are different they will usually say how to install them it should be pretty easy after successfully doing above.
- You can find mods at [ Register or Signin to view external links. ]
- MAKE SURE MOD IS COMPATIBLE WITH CURRENT VERSION OF MINECRAFT



--------------------------------MAC-OSX------------------------------

Need-
- unarchiver


Recommended-
- iUnarchiver



- You will need to get the minecraft launcher version (not 'Play in Browser'), Run.
- Login, let it install Packages (.jars), and close.
- Go to Finder
- Go to menu bar and click 'Go' then click 'Go to Folder...'
- Type - /Users/**NAME OF USER**/Library/Application Support
- Press 'Enter'
- Locate and open '.minecarft'
- go to 'bin', right click minecraft(.jar) look for 'open with... 'iUnarchiver'' or whatever you are using
- you should see lots of files, delete 'META INF'
- go to [ Register or Signin to view external links. ]
- scroll down till you find 'modloader' then click 'direct' it should download, if not use other link.
- once downloaded open with same method as minecraft.jar
- drag contents of 'modloader' into 'minecraft.jar'
- NOW USE SAME METHOD FOR OTHER MODS
- if mods are different they will usually say how to install them it should be pretty easy after successfully doing above.
- You can find mods at [ Register or Signin to view external links. ]
- MAKE SURE MOD IS COMPATIBLE WITH CURRENT VERSION OF MINECRAFT

---------------------------------Linux---------------------------------


Probably the same thing as MAC not 100% sure