In order to deactivate your account you will need to go to your account settings.
To get there manually first login to your Cybo account and click on your username at the top right of the screen.
Next click on the "Settings" button.
Here you can find the "Account Settings" link.
You should now see the "DEACTIVATE MY ACCOUNT" button.
This will prompt an alert to make sure you're sure.
The DEACTIVATE MY ACCOUNT button should now have changed to "ACTIVATE MY ACCOUNT" with confirmation below.
If you decide to reactivate your account simply hit the button again and verify.
*Note* You will need to reclaim your businesses manually.