This guide will help in setting up the Qwil Messenger addon!
If you navigate to Settings > Addons, you'll see a tile for Qwil Messenger:
In the pop up after clicking on this, you'll see a tab for "Setup Instructions"
All the information needed to get the integration working is on here.
You can sign up for a trial at www.qwilmessenger.com and Plannr users are offered a discount if you choose to continue.
If you want a preview of what the integration is capable of, here's a handy link to a video Qwil have produced.
Any issues or queries about the integration should be handled by Qwil as they built this externally.