Step 1: Visit https://www.telltalegames.com/redeem
Step 2: Create Telltale account. (Or login if you already have Telltale account.)
Step 3: Enter login credentials.
Step 4: Click "sign in".
Step 5: Locate your activation key from delivery email.
Step 6: Enter provided activation key.
Step 7: Click "REDEEM".
Step 8: Click newly acquired game.
Step 9: Download and play game.
We hope this helps, and if you need any further assistance, we have 24/7 support that can be reached via email at email@example.com, via our live chat at gamecheap.net, or by phone at 1-888-507-9992.