Three steps : Step 1)
take a blank piece of paper and write your message.
Pray send a copy of the will of Mr Willm. Cross, of Gorbiston in Suffolk, proved about a fortnight or three weeks ago
11 Nov 1823
Messrs Kitson & Backham, Norwich
fold the paper, keeping the message inside, so that the two ends will tuck into one another, and write the address on one of the outside panels
Messrs Kitson & Backham Norwich
when the address has been written, tuck the ends of the letter into one another and it is then ready to be lodged at the local post office, or to be collected by the postman.
It may be necessary to make a better seal, in which case a stick of sealing wax is heated by the flame of a candle, and held over the join of the ends of the letter. When a melted blob has dropped onto the letter, press a seal onto it, and as soon as it cools, the letter is sealed. The sealing wax was usually red, but in this case it is black.