Deals Missed reflects the amount of deals that have occurred within your MLS, since you joined First, from contacts in your First account.
To access your Deals Missed, click on the Home tab of the First app and scroll down to your Personal Network Efficiency graph. Here you will see two buttons on the top, Deals Won and Deals Missed. Click on Deals Missed.
This section will show you all the deals that occurred from contacts in your First account, that occured since you signed up for your First account, that did not have you listed as the Listing Agent or Buyers Agent.