1) visit shipping master's office from which your CDC is Issued
2) obtain a letter from a company requesting stamp on CDC If you Want it Next day take another letter from company stating you need ILO stamp urgently
3) envelope with 50 rs stamp and write your address on it
take a letter and its copy and cdc and give to clerk there who will stamp your letter copy as receipt
he will post then your CDC with envelope given in few days
