You can easily edit a track once you have created it!
- Click on Tracks
- Click on All Tracks
- Click on the name of the Track you wish to edit
- Click Edit details
- Make any adjustments you wish to make
- Click Save
To add the "Owners", click on the "+" next to the name of the person that should be owner of this track. It's okay to have multiple track owners.
Note that the "Number of sessions" can be as high as you want it, and does not have to match the number of sessions you actually use it for, as long as the capacity is large enough for all of the sessions you wish to include in the track.