Delete topic or comment

Courtney • Miscarriage 2014, baby#1 born May 2015, miscarriage March 2016, miscarriage twins May 2016, baby#2 born April 2017, TTC baby#3.
Hi
​Does anyone know how to delete a topic they've started or a comment you've added? I want to write a comment to just one person (give her my phone number) and then be able to delete the feed once she's seen it. Is that possible?