To remove colleagues from your account, you must be a Yesware admin/account manager. To access the self service portal, go to the Menu section of the Yesware Sidebar in O365 and select "Manage My Teams." Then, in the far left margin, click "Settings." From there, navigate to the "Users" section of the left hand menu. Then select the user(s) you would like to remove and click the "Remove" button in the upper left corner of the modal.