If you click on the options (3 little buttons) for the post, do you see a delete option?
Or is it only us moderators that have this?
As a moderator I don't see exactly what you see, so I don't know.
At worst you can edit and replace your reply with nothing or change it to "Please Delete" and one of the moderators will take care of it.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10