Facebook question

I have not really learned how to use Facebook. This morning I inadvertently put a comment that was suppose to go on a funny cat video on to an autistic kid's new hair cut photo. I made the comment to his hair cut that I liked it, and then commented, "good laugh" which was supposed to go on the cat video. This kid lives on the West Coast, so I am hoping someone will tell me there is a way to erase my second comment before he sees it. 

On the right at the top of your comment, you may see a small gray arrow, which when clicked should give you the option to delete or edit.

Just know that if you edit it, the original comment will still be available for viewing.  You're best bet is probably to delete and re-comment.

Ok, thanks! I think I was so panicked I couldn't see that tiny grayed icon