To remove a competitor from a Competition, you have to go to the Edit Competition screen.
To do so, click on the Marketing tab on the left, and then click Track -> Competition. You will see the Competitions table that includes all of your currently tracked Competitions. Note that you can sort the table by clicking on the column names. You can also search for the Competition by entering the name into the Filter text field and hitting “return”.
To update a Competition, click the “Edit” link in the Actions column, which will display the Edit Competition section. Use the “-“ icon to delete a Competitor.
Click “Save Changes”.