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And in Outlook, you can manage DG membership via the Address book.
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I have created a O365 distribution group and grant an user who use OWA only owner right to that group. <br />
<br />
How do that owner add group members in OWA? &nbsp;<br />
<br />
If I grant another owner right to another Outlook user, how does that Outlook user add members in the group?<br />
<br />
Thanks.
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I have created a O365 distribution group and grant an user who use OWA only owner right to that group. 

How do that owner add group members in OWA?  

If I grant another owner right to another Outlook user, how does that Outlook user add members in the group?

Thanks.

And in Outlook, you can manage DG membership via the Address book.

Office 365 distribution group owner add members instruction in Outlook and OWA.

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.