It is currently not possible to change competitors in RevControl yourself.
However, you can request this by sending an email or chat message to the support team.

Let us know which competitors you want to add, but keep in mind the maximum number of competitors. You may have to remove a competitor from the competitor set.

After RevControl has made the adjustment, the auto publish is deactivated.

It is wise to check the competitor index first and enter the new scores, before activating the auto publish again.
You can check the rates in between at competitor based rate check.