If you have an admin role in your company account in Get on Board, just go to the 'Manage Users' option where you can delete and add as many users as you want.
Please note that in each company there must be at least one person with admin role. If you wish to remove the only user with an admin role, you must first send an invitation to another member and assign him/her the role before doing so.
If the person to be removed is the only one with admin role, please write to us in the chat to assign your new admin role so you can remove him/her from your account.