To create a User, e.g. a committee member, select Organisation > Users and Roles
If the Contact is already in the Users list, you can adjust their User Rights by selecting Edit User Rights and clicking on the appropriate check box item to unlock it - or, give them the permissions for that level.
If the Contact isn't yet a User, you can add them and give the appropriate User Rights.
Shop User Rights
If a Contact has Shop User Rights, when logged in they will be able to see their Dashboard, Shop and their own Tasks.
They will have User Rights to maintain Products, Orders, Shipping Options and view Insights.
A User with Shop User Rights can update & edit a Product details, Orders, create Shipping options and view Insights.