The Board tab shows you Cards that you have previously pinned in order to keep them easily visible to you. You can pin Cards to your Board from any web-based channel.

Each Card has a contextual menu revealed when you move the cursor over it. Click to reveal the menu.

Label Definition
Subscribe/Unsubscribe Lets you toggle whether or not you want to receive notifications about updates to this Card
Unpin from my Board Lets you remove this Card from your Board. It can later be re-added from the chatbot
Configure Card Admins only. Opens the Card configuration in the Administration area.