Their PP states it’s possible to deactivate your account by sending a request to email@example.com.
If that’s nog good enough, try this other part from their PP… Okay, things become somewhat unclear because we’re now riding the road to true deletion, which seems to exist too (not too neat):
We make good faith efforts to honor your reasonable request to access and correct your data if it is inaccurate or delete the data if we are not required to retain it by law or for legitimate purposes. We will respond to your request to access within 30 days.
For this, you may try the same email address as named above or firstname.lastname@example.org.
Anonymisation goes via your profile page: http://www.cisco.com/web/siteassets/account/index.html