If you do not find a description that matches your expense,
you can/should enter it as an other deduction with a description.
For example, the lock box fee
could be a part of office expense, the desk fee you pay your broker maybe rent
expense. The Real Estate Association dues maybe "Dues & Subscriptions" or "Professional Dues".
The idea is to separate them in a way that is easy to recognize for you and the IRS. Do not lump a lot of items in one category like "Legal & Professional". MLS fees are a large expense - put them as an other deductions with the description "MLS Fees".