If you’re signing up for Keywords for the first time, you’ll see a Subscribe button when you click the Keywords menu item:
You can also activate the Free version of Keywords, if you only have a few keywords to monitor, or would like to try the service before subscribing.
Clicking the Subscribe button will take you to the Payment page where you can subscribe to the monthly Keywords service. You’ll see your other payments and the Keywords option selected:
Click the “Continue To Payment” button to confirm the addition of Keywords to your monthly services.
Note that you can cancel at any time.