If you have already filed your case, removing counsel should be as simple as contacting the Clerk of Court in writing and informing the Court that you no longer care to utilize the services of your attorney. (You can state the reasons for removal or not, as you wish.)
You should also state in the letter that you will proceed with your bankruptcy case pro se and will represent yourself going forward.
Make sure that you send a copy of the letter to your attorney as well.
While the court may require that you follow up with a more formal motion, starting with this step will allow the court to instruct you as to whether or not the letter is sufficient.