All you have to do in order to start playing, is to follow three simple steps.
Step 1. In order to play Scrolls, you need to have a Mojang account. If you don't have one, or if you have a Minecraft-account but still have not upgraded it to a Mojang account, go to http://account.mojang.com to register/upgrade.
Step 2. To add Scrolls to your Mojang account, log on to http://account.mojang.com and click the link "click here to redeem the code". Paste in your gift code. After you have entered your gift code, you will get to chose a in-game username. (NOTE: Once you have done this, you have secured your alpha code, There really is no need to move to Step 3 until this part is completed)