Customize Priorities
Go to Priorities.
Enter a priority name. You can also enter a description. This is optional.
Select a color to represent the priority (optional but recommended).
Click Add. Your priority appears at the bottom of the list.
Note
Remember that you need to have at least one active priority (not deleted). You can't delete all of the priorities from your list.
Default Priority
Zephyr Squad applies automatically one priority to all your new test cases. You can change it. Pick priority from the list and mark it as default: