To add and manage staff accounts on Shopify, you first need to navigate to your Shopify admin dashboard and go to Settings. From there, click on "Account" and then "Staff accounts." Here, you can add new staff members by clicking on "Add a staff account" and entering their email address, name, and permissions.You can also manage existing staff accounts by editing their permissions, disabling or removing their access, or setting an expiry date for their account.