Steps
  1. 1 Download TLauncher, we find it is the best as it allows easy access to Optifine and Forge.
  2. 2 Move the .jar to somewhere, like your documents folder.
  3. 3 Open it and let it download the libraries it needs to.
  4. 4 Check the Account box and then log in with a Mojang or TLauncher account. (Note: This allows you to play without an account, but then you can't use servers.)
Extra Steps
  1. 1 Right click the .jar and make a shortcut on your desktop.
  2. 2 Download the icon file here.
  3. 3 Go to the shortcut on your desktop, right-click, and choose “Properties”.
  4. 4 Click “Change icon” and find and choose the downloaded icon. Apply your changes.