OFFICE 365 - MODIFY MEMBERS OF A DISTRIBUTION LIST (OWA)
As an owner of a distribution list, you can modify membership using a web browser. These instructions apply to distribution lists in the global address book, to lists that have their own @uwplatt.edu email address; not contact groups in your own address book. In the Office 365 web application, the tools to modify distribution group membership is buried within the old options page. This document walks you through navigating to the Distribution Group Options area, viewing distribution group membership, and adding and removing members. Please note: If a distribution list has been hidden from the global address book, you will not be able to view membership of the list.
TO VIEW MEMBERS OF A LIST
1. Sign into Office 365 using a web browser.
2. On the ribbon, click on the Settings wheel button. From the drop-down list, click on Mail. 
3. In the left navigation pane of the Options page, click to expand the General menu.
4. From the General list, select Distribution Groups.
5. In the Distribution groups I own section, select the distribution group you want to modify from the list and click the pencil icon. Please note, if the distribution list that you want to modify is not listed, you may not be the list owner or the list may be hidden. Please contact the ITS Help Desk for further assistance. 
membership
TO ADD MEMBERS TO A DISTRIBUTION LIST THAT YOU OWN
'+' (plus)
'+' (plus) 
Save 
Save 
6. Click the back button in the left column of the Options page to return to your Office 365 mail. 
TO REMOVE MEMBERS FROM A DISTRIBUTION LIST THAT YOU OWN
- (minus) 3. Repeat steps 1 and 2 for all people you want to remove from the distribution list. Save 5. Click the back button in the left column of the Options page to return to your Office 365 mail.