When you create a distribution list, you can add other user accounts to manage the distribution list. Owners can view, edit, add and remove members in the DL that they are assigned as an owner. You can add owners when you create the list, and you can edit distribution lists to add and remove owners. Owners manage distribution lists from their account's Address Book, Distribution List folder. If they are the owner, when they right click a distribution list, the Edit Group link is available.
Go to Manage > Distribution Lists and select the distribution list to edit.
Open the Owners page.
Click Add and enter the owner's email address. Only internal accounts can be made owners.
Click Save.
Go to Manage > Distribution Lists and select the distribution list to edit.
Open the Owners page.
Select the name to delete and click Delete. The owner is deleted immediately.
Click Save.
You can add an account to a distribution list in either from the Account's Member of tab or the Distribution List's Members tab.