The price you set on a member type is the price the player pays when they apply for the membership. Note: You don't need to fill in the price if you don't intend to sell the member type online since it won't appear. In that case, you need to manage the payment elsewhere and add the membership to the customer manually.
If a membership type should differ in price when it comes to reservations of drop ins or subscriptions you'll edit this under "Administration" > "Price list".