Cancel your account when editing your profile.
Edit your profile by first logging in and clicking on your name or photo in the nav to be taken to your profile page.
Once you're on the profile, hover over the the gear icon on the top right corner of your profile card and select "EDIT PROFILE":
Your profile card will flip around and you will see a DEACTIVATE ACCOUNT link:
Once you click this link, you will be walked through the deactivation process.
REMINDER: Deactivating your account will subsequently delete any Give InKind pages you have created.