Quoting Removed, click Modern View to see
Hurly seems to be talking about classic view and it appears you are using modern view.
In modern view, when typing your reply click the URL button above the box you're typing in, then paste your address and click the URL button again.
That should at least give you a clickable link like this:https://maine.craigslist.org/grd/d/new-gloucester-ford-740/6991293749.html
It's not as pretty, but it's a start. If that works, I can probably help with making it pretty too.Ford 740