Open the Joomla Backend at http://ctsportsplex.com/administrator and login
Click RSForm! Pro
Click Manage Forms
Open the Appropriate form such as "Baseball Registration Form"
In here you can adjust any item. You are probably looking for the List of Tournaments/League with their prices. It is the first Item.
Click edit to the right of it
In the "Items" window, you can add, modify or delete items. Be carefull to ensure the "pipe symbol | " is dividing the price from your description.
*** Modifying items here only affects the actual Tournament or League registration form.