Platform Racing 2 is a game run by the developer. You’ll need to contact them for assistance. To do so, to to the game page, click the “Report a bug” link and fill out the report.
Under each of your posts is an “Edit post” button. If you have anything more to add to your post, or noticed you made a mistake, you can simply edit and fix it. :) To delete multiple posts, click the “Edit post” button and on the right hand side there’s the “Delete post” button.