Settings → Users & permissions → Invite user. Type their email, pick a role, send it. They get an email; if they already use RunGrid, they are added to your company straight away.
Re-send invite if it never arrived — check spam first, it is usually there.
The roles
·Owner — everything, including billing and removing people.
·Admin — everything operational. Cannot remove an owner.
·Accountant — the books, reports and banking. Not payroll settings.
·Manager — day to day work: customers, invoices, projects, tasks.
·Viewer — read only.
Payroll is restricted separately: it is not visible to a role that has no business seeing what everyone earns.
One person, several companies
The same login can belong to more than one company. They switch with the company picker at the top left, and each company's permissions are separate — being an owner of one says nothing about the other.