Assign test runs that are unassigned
Select the unassigned test runs that you want to assign a user to.
The Select user drop-down list is enabled.
From the Select user drop-down list, select a user to assign the test runs to.
The Assign icon is enabled.
If you mouse over the Assign icon it will show how many script runs will be assigned to the user.
Click on the Assign icon.
After assigning the test runs the colour will changed from dark grey to light grey as they are assigned to a user.
If you mouse over any of the test runs that were just assigned it will display the assignee.