Avoiding HTML Code add on when working in Wordpress.

My Ring Central App has recently begun adding random code and logo to the end of all my posts and page designs in WordPress and Zendesk Community posts.

It shows up after I publish and in the case of Zendesk will not allow me to delete code and save changes saying I'm missing image which was the logo of ring central.

How to do I stop this action and prevent Ring Central from adding code to items it does not belong with?