[Need help to get started - generate Banner]

Hi all,
i got some problems to get started. I read the manual, but I got a understanding problem because my english is not the best.

 

I want to generate a Banner Code for my Website.

What i had done:

Clean Install the news version.

campaigns:  I add a new campaigns

Banner: I add too banner

Website: I add my Website

 

I go to WEBSITE - MY WEBSITE - BANNER CODE
and add this code on my website.

If I reload my website, the will be no banner.
Is there anything I forgot?
Do I need Zones?

Regards Tim