Hello today I will be showing you how to install optifine!!

First download OptiFine 1.6.4 here

Then click download. It should look like this

Then once it has finished downloading, it will open up a WinRAR folder called OptiFine. Drag that from the WinRAR onto your desktop.

Then double click it and a thing like this should appear

After you have seen that, click the Install button

Then a thing will pop up like this

Then all you have to do is open up your mincraft launcher, then log in then it is done!! Congrats!!