kiugetski wrote: its my first day on this community builder 
Welcome to Community Builder then and to Joomlapolis.
Installation should be a simple download of CB 2.0 package of the latest nightly release (paid members can access this) from the CB page here:
www.joomlapolis.com/community-builder
Once installed you might want to look at our Getting started series here:
www.joomlapolis.com/documentation/community-builder/getting-started
Also please note that each backend page has a help button that you can click on for page specific help info.
nant