How Do You Write a P.S. in a Letter?
A P.S. is always the very last entry in a letter. P.S. stands for postscript, and it is an afterthought related to an idea already mentioned in the letter or something completely separate.
Sign the letter
At the end of the letter, sign your name.
Enter the P.S.
Directly below the signature, enter the letters P.S. Then, write the additional information.
Keep the postscript short
A P.S. should only be a sentence or two. Anything longer should be in the body of the letter. If there is a lot of new information to be added, it is best to create a new paragraph incorporating the postscript text.