Sign in to your Dynamics CRM Online organization and follow the steps below.
Navigate to Settings > Security.
Click on Users.
In the list, select the user or users that you want to assign a security role to. Proceed by clicking on Manage Roles.
In the list of roles, scroll down to the System Administrator role and make sure it has a check mark next to it.
This user is now eligible to set up the integration between your SalesScreen and Dynamics CRM Online organizations.