You need to write HTML in the source not the normal editor like you did in the first pic. Everything you do in the editor like adding pics, colors etc is converted to HTML in the source. When I made my profile I mostly worked in the source and only checked the editor to see if it looked the way I wanted. Also please note that not every HTML code will work on Viki like for example background music, change of cursor etc.
When in blogs you have to change through html codes, in viki everything this is through the source. best way to do it is go into a channel you like that has the style and inspect the element, and copy its code but change color code to your liking.