Help with sharepoint rules and notifications

Hello All

I've set up a rule on a number of Sharepoint lists we are using for surveys with our customers.

We want an email to be sent to users when a certain column is updated to their name which we've done by clicking "Automate" and "Create rule" on the Sharepoint list.

What are the three lines coming off the rule below and what does it mean?
We are having issues with emails not sending to notify people when they are tagged.