Sign in and edit your profile

Edit your profile

Select the Settings icon, and then select Edit Settings.

Your name, email, and work information is pulled in directly from your organization's directory.
Add information like your expertise, interests, and a link to your LinkedIn profile.
Select Save.

Now coworkers can click your name or photo to learn more about you and Yammer can use this information to help you create connections and build a strong network.

Source: Microsoft