You can comment on cards and tag other Anaplan users who have access to the source model of the card.

When you comment on any type of card, the comment applies to the current set of context selectors.  

On a board, select the Comment icon in the top-right corner of the page to view a summary of all card comments within the current context. 

The comment summary panel shows the latest comment in a conversation thread, that is attached to a card. To drill down into the comment thread, select the conversation.

You can add mentions to users by using the @<username> format. However, you can only mention users who have access to the source model. If the user has access to the model but not the page, they will be notified and can see the comment message. 

Learn how to: