On the left sidebar, under Settings go to Account. Hit the "Deactivate Markee" button.
Deactivate Your Markee
Check out the helpdesk article below and let us know if you still need support!

How do I deactivate my Markee?

For your security you'll have to confirm whether you want to deactivate your Markee or not.
You can reactivate your Markee anytime!
We are so sorry you are having an issue. Please don’t hesitate to contact us at support@markee.io if your issues persist.