I do not have nothing to click on my own post.
So, no, you can not change your own if you are not admin.
I can't either for here so I must have to do it from the back end only.
Orion, When I edited some post of mine in the (Ellipse Vrs Dot shape) thread... to be more politically correct, it may have removed your action if it was mine that you smited in that thread. Not sure when you smited or if it was me at that time. I only had one that I removed and it happened to be last night near the same time I was posting and editing my post. At any rate, my one is back on.