Follow the steps in this article to add admins and users to Yammer.
Add and manage users on Yammer
People are the core of the enterprise social network, so invite your team to get started on Yammer via the Yammer Admin Center. Depending on the size of your company, there are direct actions that you can take as a Yammer Verified Admin to get your team onto Yammer all at once.
Users who are added via the Office 365 Admin Portal are automatically added to your Yammer Network when they click the Yammer tile or log in to Yammer for the first time. For more information, see Manage Yammer users across their lifecycle from Office 365.
You can also add users individually to Yammer using the following method.
To add users to Yammer
Add users in bulk from the Yammer Network Admin center by choosing Network Admin > Users and then one of these options:
Invite Users click import an address book to import email addresses from Outlook.com, Gmail, Plaxo, or Yahoo accounts, or upload a contacts file from email applications such as Outlook and Apple Mail.
Bulk Update Users allows you to import a .csv file exported from your enterprise email applications.
If you want to automate provisioning and deprovisioning users or want to use single sign-on, see Manage Yammer users across their life cycle from Office 365 and Office 365 sign-in for Yammer to decide which options work best for your organization. You can use the options available for Office 365, or you can use the following methods from Yammer:
Appoint More Yammer admins
A successful Yammer network depends on active community management and network adoption. Appoint additional admins from across your company to serve different functions–from managing technical integrations to driving community adoption and best practices.
Yammer admins can customize branding, enable and disable features, integrate Yammer with other enterprise applications, manage users, monitor activity, export data, and more. Learn more about Yammer Admin capabilities in the Yammer Admin Guide.
To appoint Yammer admins
In your Yammer Admin Center, go to Network Admins > Admins.
Review the Office 365 Global Admins who have been synced to Yammer as Verified Admin, which is indicated by a button that reads Change Status of Office 365 Admins. By using this button to remove a user as a Global Admin, you can revoke other Office 365 Global Admins from having Yammer Admin rights.
Enter the user you want to appoint under Appoint Additional Admins. Admins who are appointed within Yammer do not become Office 365 Global Admins, and they have access only to the Yammer Admin Center.
Newly appointed admins are designated Network Admins and have restricted rights. To assign full administrative rights, click Grant Verified Admin.
Verified Admins can also grant Verified Admin privileges to others, and they can grant or revoke these privileges any time. Please note that you cannot remove yourself as an admin. You must ask another Office 365 Global Admin to do this.