Naturally you need to have a Gmail account. This is where to get one if you don't already have one.
Step 1: Sign into your Gmail account and go to inbox. (see figure 1)
Step 2: Click on Settings, located on the top right of screen. (see figures 2 and 3)
Step 3: Click on Labs in the Settings Menu (see figure 4)
You are in Gmail Labs and can review, activate, or deactivate any of the features here.