Prerequisites
You must have products to sell which are created with Event Setup Assistant and/or Product Setup Assistant. If you have events listed on your Events Page and haven't deleted any of your products, you will have at least a Participant Registration Product to sell.
You must be logged in as a Customer Admin user to perform the above actions. See User Permissions if you need assistance granting access to additional users.
Next, you need to set up the following:
You must be logged in as a user with Point of Sale Admin permissions to perform the above actions. See User Permissions if you need assistance granting access to additional users.