resizing flash player

Hi, in the newest version I can’t seem to resize the flash player correctly.
It used to be when I clicked on ‘add a new media file’ there was a space to define the size of the video and/or player (not sure), but now that option does not exist.
There is a place under options:playlist but even when I redefine it there, the player still comes out a different size on my blog.
I’ve been using this plug in for six years and have never had this problem.
I also just recently updated my version of wordpress to the latest version, just in case this somehow has added to my difficulties.
Could you please assist?

Thank you

https://ww.wp.xz.cn/plugins/wordtube/