Once in the Manage screen, you can invite officials to help you with your competition. Head to Officials tab from the left side.
Simple click ADD OFFICIAL and complete the form.
Search for the person first of all to see if they are in the database. If so, click on them and choose the role and invite them. If not, click NEW PERSON and fill in their details, choose role you wish to assign them and click INVITE.
The person will receive the invitation via email. This will include an activation link, which they need to click to accept the invitation so they can and help you with the event.