There are two ways you can invite your employees.
First, the recommended way to initially invite your employees in bulk is to upload a CSV file. The first column in the CSV file should list your employees' full names and the second column should list their work emails. Just in case you were wondering, we do absolutely nothing with the email addresses except use them to send out invites and create the employee's Fond account.
You can upload a CSV file by selecting Admin > Manage Employees > Invite New
Then click on Switch to Bulk Email Invite CSV > Choose File > Invite Users.
Your second option is to use your Admin tab to invite employees. You can select Admin > Manage Employees > Invite New > Add Emails > Invite.
To remove an employee, simply select Delete next to their name in the Manage Employees tab.