Thanks SouthseaSteel,
Following your list,
After clicking on DNA
"Your DNA tests" nothing there about editing manager.
"DNA tests shared with you"
You've been invited by others to view, collaborate and/or manage these DNA tests.
My DNA test does not appear there.
Do I need to use my mothers account?
Mick
Top right corner which I think should be your initials, to go to Account Settings.
Click on DNA within the left hand side list of options
Click on the relevant DNA test if there are more than one
Go down list to DNA Test Sharing
Invite the relevant person as Manager from the drop down list