When you load a file to the AMV converter it will appear in the list window at the bottom. You need to select it by clicking on it to activate the settings button or double click on it to open the settings window.
Failing that try using version 3.57, you can edit the settings in the transformsetup.ini as posted here:
http://www.mympxplayer.org/full-scre...or--vt449.html
If your player is 1.5 inch you will need to substitute the 160x120 setting for 128x128 or 128x96
you can download 3.57 here:
http://www.mympxplayer.org/amv-conve...63-mb-df1.html