write on line number two (2) of the file

"❄️Suresh sureshnawras-/[email protected] [power-pro]" <[email protected]> Sun, 17 Mar 2019 13:56:06 +0530
Newsgroups gmane.comp.windows.power-pro
Message-ID <[email protected]>
Hi,

file.writeall(?"D:\Powerpro\Mtoday1.txt", date) replaces the file data.

how to write on line number two (2) of that same file? (Without making 
changes to the first line)

Thanks for any replies.