If you need to create many staff accounts you may prefer to use the import feature described in How do I import my staff roster?
Class access gives user access to selected classes. School gives user access to all school data. District gives user access to all district data. What are the different types of administrative user accounts? will provide more information on the three types of accounts.
The activation email will contain a link for the staff member to set their password and information on how to sign into their account.
Click the box next to the staff account and then click Send Activation Email