Android base carpool application with firebase as database

Im creating an application about carpooling service. Im using firebase as my database. The application is let the user who want to be driver to add a carpool post to a passenger page (the user should be able to delete or edit the post). Then, other users can look for post at the passenger page and click into the post. I want to make a destination filter on the passenger page so that the user can search for post easily. Inside the post, user should be able to click on a button and show he/she is interested to the carpool and automatically book a seat of the carpool. I have done half way of the application i have finish the register and login page, the posting function.