I try to just go into Direwolf_1.6.4 and go into minecraft then saves and paste it into the folder but it doesn't work! help please!
If you are referring to the "Let's Play" world(s):
1). Download the 'zip' file to the appropriate directory... In my case, using Win 8.1: "C:\Users\Dave\AppData\Roaming\ftblauncher\Direwolf20_1_6_4\minecraft\saves".
2). Extract the 'zip' archive. I just right-click the 'zip' file, select "open", and copy the directory inside to the "saves" directory... Windows supports Zip files.
3). In the "Episode XX" folder there is a folder called "world". Move this up to the "..\saves" directory.
4). ...
5). Profit.
Extra Credit: You can go into the "World\players" directory and copy "direwolf20.dat" to "[MyPlayerName].dat" and get all of Dire's Thaumcraft and Ars Magica research.