In order to give access to user for any school, please follow the steps mentioned below:
Click on Roles and Admins Administration from the top right corner.
Click on list admins tab.
Click on the 3 dot icon on the left most column of the table.
Select grant access to school from the drop down menu.
Once you have selected the grant access option a pop up screen will appear.
Select School from the list of schools added in the system.
Select the required Role for each school (these roles are already added in the system).
Click on Save button.