Not sure if you solved this yet, but if you check out this video it shows how easy it is to edit a post:
https://www.nyccnc.com/vs-code-editing-posts/
Doesn't hurt to know a bit about javascript, but you can figure out what's going on pretty easily.
Starting a post from scratch won't be so easy, but just find one that's kind of close and make the edits you need.
Hope this helps,
Dan