In Slack, go to the channel where you have your to-do list that you want to rename
In the channel, type /todo list and press enter
This will bring up the to-do list in the channel and a link to the Dashboard
Click the link which says "View in Dashboard"
Alternatively you can click on this link and login with your Slack credentials to visit the Dashboard.
By clicking on View in Dashboard, it will bring you to the list in the To-do Dashboard where you can change the name of the list
Click on the name of the list to re-name the list
Press enter to save changes
You will receive a green notification at the top right hand corner once the name has been saved