@johnnielsenmail: Thanks for using Simple Catch Pro theme.
1. One how do I change the colour of the search button in the header?
— You can add the following CSS in “Appearance => Theme Options => Custom CSS” box. You can change the color code as per you need.
/* Search Box Background Color */
#branding .searchform .search-box,#sidebar-top .widget_search .search-box input#s { background-color: #fff; }
/* Search Box Text Color */
#sidebar-top .widget_search .search-box input#s { color: #888; }
/* Search button background and text color */
#branding .searchform button { background-color: #333; color: #fff; }
2. How do I change the colour of the tree dots under the image slider on the from page?
— You can add the following CSS in “Appearance => Theme Options => Custom CSS” box. You can change the color code as per you need.
/* For dot static color */
#controllers a { background-color: #b7b7b7; }
/* For dot hover and active color */
#controllers a:hover, #controllers a.active { background-color: #000; }
3. finally how do I remove the stripe (blurry) effect from the picture slider on the first page.
— You can remove that from “Appearance => Theme Options => Featured Slider => Slider Options”. Then check on “Disable Slider Background Effect” and save.