could not edit modules contents

There is no general background image only color that can be changed from template options ?
Are you maybe referring to some image form modules?

pls see the attached image

thank you.

Pls I also wants the content area to be in white,

To change background in template_css.css

.messagerow {
background: url(../images/custom/message_bg.jpg);
background-attachment: fixed;
text-align: right;
padding: 140px 0 40px;
}

for content you can add at bottom of same file:

.content_sparky{
background:white;
}

Thanks for your support. Pls where and how do change the yellow area of the template. See the attached file.
Regards

In template_css.css

.sparky_inner h2 {
background: #f6cc26;
padding: 15px 0 30px 0;
}