To edit or remove tickets, select the ticket of your choice from the "Tickets" panel of your event's dashboard.
You will be directed to its ticket form allowing you to edit your ticket's information (name, price, etc.) as shown below.
If you wish to remove a ticket, simply click the "Remove ticket" button located at the bottom of he form. If tickets of the type have already been sold, tickets can no longer be removed. Instead, click the "End sales of ticket" to automatically set a past sales period and make the tickets unavailable for further purchase. The message below will be prompted to request confirmation.