To edit your listings price, go to Boats > Manage > Pricing (pictured below).
You can then set the daily price of your vessel (pictured below).
The rates you decide on are completely up to you. As a new owner, you may want to charge lower than average rates to attract renters who are comparing your boat to those with reviews. Once you have a review or two, adjust your rates as needed. Typically, listing prices vary depending on boat type, amenities, age of boat and the market in which your vessel is located.