Hi Dave, thanks for getting in touch. I hope all is well with you :)
You can create other users by going to Users and Groups (click the link at the top of the page) in the Admin System. When you're creating a user you can tick 'Administrator?' to make them an administrator. You can't set their password, but they'll be emailed a link to click to set their own password.
Please let me know if you need any more assistance with this.
Have a great day! :D
Founder | Spike@School
Level 1, 6 Garden Place, Hamilton 3204 | PO Box 303, Waikato Mail Centre, Hamilton 3240, New Zealand