Step 3: Enter your DOOM game key and select Next Step 4: DOOM should be successfully added to your Library. Step 2: When in the Steam menu: - Select Games then Activate a Product on Steam - After reading the terms and conditions, select.
Step 3: Enter your DOOM game key and select Next Step 4: DOOM should be successfully added to your Library. Step 2: When in the Steam menu: - Select Games then Activate a Product on Steam - After reading the terms and conditions, select.