Hi Shamim,
Yes I have tried the Settings/Appearance options but they do not affect the colors for most of the choices provided in your plugin for some reason. I had hoped upgrading would have fixed this but it did not. I got the css I tried already from your support page but that did not include the code for the submit button or the active button and text so as per my image sent these two cannot be adjusted with the Settings/Appearance options. I will try to track it down in some other way and if I cannot find a remedy I will simply remove the plugin and try another one.
Thanks
Mark Cramer