There are a couple of things you can do here. If you’d like to edit the size of the area, here’s how to do it.
1) Go to the appearance section and select edit to open up the theme editor.
2) From the list of files on your right, choose style.css
3) Look for this spot:
#slideshow {
float: left;
display: inline;
width: 630px;
position: relative;
z-index: 1;
}
and edit the line “width: 630px;” by changing the 630 to the width you’d like for the area in pixels.
4) Save your changes.
The other option is to change the size of the video you’re embedding. You can generally set that when you are given the embed code for your video. For example Vimeo has height and width values as part of the video embed code. You can manually adjust them to get the size video you’re looking for.
Let me know if you have any other questions,
Bill