There are four simple steps that you will need to follow in order to change your login username in Alarm.com:
1. Go the "Profile" tab in Alarm.com. It is going to be the furthest tab to the right.
2. Click on the tab, and the click on the "Login Info" option in the sub-tabs.
3. In the options there, you will see "Change Website Login". Here is where you can change your login username.
4. Once finished, just click on "Submit" and you will have successfully changed your login username for Alarm.com.