How do I change my Akismet plan?

First you need to log into your Akismet account:
http://akismet.com/account/

Note: To access your Akismet account you need to log into your WordPress.com account. If you have an Akismet subscription than you have a WordPress.com account as one was created when the Akismet account was created. It is the same login information you use to sign into Akismet.com.

If you have forgotten your password you can reset it here:
https://wordpress.com/wp-login.php?action=lostpassword

Once you login you want to look for the “change plans” link on the left side of your account page, under Subscription. Pressing that button will allow you to choose a different plan for your account.