Vidomi Question

I went through the tut provided by chickenman and I was able to do everything in it except when it came to the output size options. Everything was shaded out except at the very bottom where it said Maximum File Size. How can I change it to where I can set the target size? I changed nothing other than those things that were specified in the tut. Thanks for any input
 
Dont know why the top part is greyed out, but just enter 699 in the Maximum File Size and it will encode to that length for 1 80min CD.
 
Top