Yes.
If you simply want to delist the book, you can log in to your account and go to your book page. There you should click on "Edit" link and under "Who should see this book", select "Only me". Once you save the book, your book is no longer available for public. This option will suffice for most people wanting to take down the book.
If you want your book completely removed and not be even accessible to you, you should write an e-mail to writer@pothi.com from your registered e-mail id for the removal of the book. The e-mail should mention the SKU number (unique identity) of your book and URL on pothi.com where it is available. SKU number would be available in "Author's Dashboard" under "My Print Book" or "My e-book" links. The book will be removed within 2 working days from the receipt of the removal request.
Pothi.com reserves the right to fulfill any orders of the book pending at the time of removal.