Before you start a tennis ladder league, you will first need to register.

Go here to register.

Once you have registered, go here to create a ladder league: https://www.globaltennisnetwork.com/ladder-leagues/start-a-tennis-ladder

Running a tennis ladder is free. But, you may want to get a premium membership to unlock certain features.

To update your availability, just go to your "Dashboard".

You can find a link to your Dashboard in the "Ladder Menu", which is on the right hand side of the main ladder page.

Yes you can. You can change your ladder's ranking system at anytime. If you don't like the new ranking system, you can change it back without any issues.

An administrator can delete a ladder by going to the "Ladder Admin -> Settings" page.

At the bottom of that page, there is a link where you can delete the ladder.

You don't have to do anything different to use a wildcard. Just challenge or submit a score against a team who would usually not be playable.

This depends on the rules of the ladder. Most ladders will have a penalty for declining a challenge. Go to the "Details" page of your ladder to see the ladder rules.

If you enter a ladder match twice, you will need to contact a ladder admin. They will be able to delete the extra match for you.

An administrator can duplicate a ladder by going to the "Ladder Admin -> Settings" page.

At the bottom of that page, there is a link where you can duplicate the ladder.

Only a ladder admin can delete a challenge. Contact a ladder admin and ask them to delete the challenge from the "Challenges" tab on the ladder.