When you go to Settings - Account and scroll down to the bottom of the page you can see your account members and the dropdown next to them where you can choose their access level:
We will review what kind of access each user role gets:
Owner - it is assigned automatically when you create the account with Multiorders and it allows you to have full access to the app. If you wish to give the Owner role to someone else, please contact our customer support.
Admin - full access to the app
Manager - full access except for the Settings area
Order Manager - access to Order and Shipping pages only
Inventory Manager - access to the Inventory, Purchases, Suppliers, Reports, and Shipping pages
Orders and Inventory Manager - access to Orders, Inventory, Customers, Shipping pages