Now all you have to do is put everything back together. This is actually pretty easy. First you need to screw the controller onto the back of the drive.
Now you just need to put the drive and controller into the bottom part of the enclosure, which has two pegs that should easily slide into holes that are on the controller. After that, you snap the chrome/plastic border back on, secure the drive with the tapes (if you haven't lost them like me!) and snap the top part of the enclosure back on. All you have left now are the screws you removed initially. Just screw them back in and you're good to go! You should be able to plug in your drive and have your OS pick it up. If you're using a brand-new drive, it's probably not formatted so you'll have to format it to FAT32 (so that you can use it on any OS. The limitation is that you can't store files larger than 4GB). Look up the documentation specific to your OS for instructions on how to do that. I know that on Windows you can use Disk Manager to format your drive, while on Ubuntu you can use gparted to do the same.
That's it! I hope you found this "how to" useful!