This means that you are agreeing to release your counsel from the case. Many attorneys will ask for this if you are not paying your bill, or you are not getting along. If you do not sign this, then they have to ask the court to be relieved as counsel.
Any individual seeking legal advice for their own situation should retain their own legal counsel as this response provides information that is general in nature and not specific to any person's unique situation. Circular 230 Disclaimer - Advice given in this response cannot be used to eliminate penalties with the IRS or any other governmental agency.