When you have located a Security Role, click it and the details will show in a drawer on the right hand side. Details can be maintained directly in the fields/tree.
By clicking the secondary actions icon (icon = 3 dots) additional actions may be possible.
Edit Security Role Name
Delete Security Role
Filters can be used to locate permissions in the tree.
By clicking the primary action icon it is possible to make a copy of the selected security role, a modal will open where you enter the name of the copy.