PLZ questions about Avast 4

hello everyone hope you are well :D,have some "general questions about useing AVAST 4 (yes registered it) working great, but I DON’T KNOW :(,
situation: when I installed (couldn’t find the answer/instructions to the following)
1, how Can i change “'skins” on the AVAST,
2,how can i make sure or how do i set up avast to protect my email PLZ, (both webased,-ie yahoo- & my isp -ie outlook express- emails,from virus’s,
thank you for the help & take care ok, “jazzy”

What exact version of Avast are you using?

I got a feeling you posted in the wrong forum.