1. Open the customer (Contacts → Customers) and click Edit.
  2. In Name and contact switch on Portal access. Emails this customer a link to set up their own login, where they can see their invoices, payments and statement. Turning it off revokes the login.
  3. Save. The customer receives an activation email. The customer record now shows the state — Invited, Active (with the last sign-in), Link expired or Revoked — and a Resend button that issues a fresh link and disables the previous one.
  4. To give an individual at the customer their own login as well, open the Contact persons section and switch on Own portal login for that person.