How to change youtube thumbnail to anything in your video?

Hi, I want to change the thumbnail to anything that is in my video. please help!!!How to change youtube thumbnail to anything in your video?You can edit only three choices are first, middle, and last and you can't choose more than them.How to change youtube thumbnail to anything in your video?Ok Go to my videos. Find the video, and click edit. On the edit page, if you scroll down, you see thumbnails. I think there's 3 picture you can choose. As for choosing other thumbnails, not sure if ya can do that, but I may be wrong. Good luckHow to change youtube thumbnail to anything in your video?You can't you only ave 3 choices. The beggining, the middle, or the end.