Once you have added or created Groups for your site these will be available in the My Roles list on the Taxonomy page. From here you are able to both edit and remove them.
To edit a Group, click the relevant Edit button on the right-hand side of the My Roles list. You can then update the name of the Group.
Note, Groups are referred to as Roles within Site Settings.
To delete a Group, click the relevant Delete button on the right-hand side of the My Roles list. You will then be prompted to confirm deletion of the selected role.
Please note that if you edit or remove a live Group, it will no longer be available for segmentation, and will impact the data you see in your Reports.
Your changes or deletion to any group will only apply to your site and will not reflect in the Roles Catalogue.