How to withdraw Notice of Appeal to IAD

[toparag]

Hi,
My recent request for travel document got rejected from New Delhi.
So I had sent a notice of Appeal to Immigration and Refugee Board, Canada.

But now I have decided to withdraw the appeal I had sent as my wife is planning to sponsor me again and I don't need to appeal anymore.

Please let me know what the process of canceling(withdrawing) the notice of appeal.

Thank you.