1.1. Go to Message Templates
1.2. Press Send icon on the message you want to send.
Click on the Send Message icon in the top right corner.
Select from the Drop Down menu.
3. Select Device Group
If you are testing a bell, use the 355 Luke Test
If it is a bell to ring, use the 355 Bell Group
If it is a message, use the 355 All Devices Group
CAUTION: Try not to select multiple device groups.