Use the Blue Navigation Bar on the left, when you are managing your event, and select "Registration".
Beneath your profile, in the top-right, are the options for editing the Registration form.
Choose "Price Tiers" to go to your Price Tier Overview. On this screen you can see all of your price tiers which you can drag-and-drop to reorder how they appear on your registration form.
In the top-right is an option to "Add Price Tier", click this option to customize your new price tier.
"Price Tier Details" covers the general information for the Price Tier. The "Tier Name" will appear next to a check box for attendees to choose when they register. Next is setting the price, if it is a free event enter "0.00". The limit is the maximum number of times a price tier can be used by ALL registrants.
"Quantity" allows you to create a price tier where the registrant may want to buy multiples of an item, such as merchandise. Attendees will see a drop-down window with the range you set here.
The "Promo Code" Section allows you to set up a code which will be required to choose this price tier. Click the toggle option to the right, when the option is enabled you will be required to enter the code exactly how you want your registrants to enter it.
The Description allows you to enter any text you would like your registrants to see as they make their selection.
The next section will ask you who you want to pay the transaction fee. Choosing "Attendee pays transaction fee" will add any merchant and processing fees to the Order Summary. "We pay transaction fee" automatically removes the fees from the sum after the registrant has completed their transaction.
"Days Included" associates a price tier with a specific day(s) that you have created on your agenda. Sessions which require registration can be selected based on what days the session and price tier are associated with.
The final section controls the availability of the price tier.
Set the "From" and "To" dates and time for when your price tier will be available. If the price tier has a promo code, the code can only be used between these dates. If you ever want to quickly turn off your price tier, there is a "Disable Price Tier" toggle at the bottom of the page.
Make sure to "Save" at the bottom-right of the page!