Get someone’s attention by tagging them with an @mention. Type @ before the person’s name. Matching names will display as you type. Select the name you want from the list and it will turn blue.
Figure 1: How to @mention
Figure 2: @mention icon
When you send your message, the person you @mentioned will receive an alert in their toolbar under @Mentions. Likewise, if someone @mentions you, it will appear in your @Mentions.
Figure 3: @mention layout