To add a new competitor to your account:
Go to the Companies section here.
Click on the Add Competitor button.
Add the competitor's domain in the 'Competitor domain' field.
Edit the competitor's name and select a color for their profile.
Click on the Add Competitor button.
To remove a competitor from your account:
Go to the Companies section here.
Click on the competitor you want to remove.
Click on the Settings tog icon in the top bar.
Click the "Stop tracking" button.