Edit Distribution Lists in Microsoft 365

In Outlook on the web, click the settings gear (upper right corner)

Open

In the search box start typing distribution and select Distribution groups (also under General > Distribution Groups)

Open

Click the link to open the distribution list portal

Double click the group you own and would like to edit. You can also search for a group if you own multiple groups to find the group easier.

You can add/remove users under membership, you can also edit the managers under ownership

Select Default Global Address List, enter user’s name, click + sign next to their name then click Save