First you sign up for a Surety plan, then you follow the instructions to set up your Alarm.com account using System Manager on the Surety website. Sorry about the lack of clarity on the SEM instructions. Here is the set up guide we give people using a Qolsys panel, which is most of our customers.
It’s the same with the SEM except for the parts about installing the hardware. You would replace step 3 of the Qolsys guide (easy installation wizard) with the After Alarm.com account creation run a Zone scan part of the SEM instructions. The main thing in that step is getting the panel to connect to your new Alarm.com account via cellular and sync everything up.