From your description I assume that you have Wowza installed on your local machine.
In order to have your website visitors access the live stream you are publishing, you need to make your Wowza installation accessible by your internet users.
You have to figure out what is your public IP (http://www.whatismyip.com/). If the computer with the Wowza server installation is located in a local network, accessing the internet through a router, you need to configure your router to forward the TCP/UDP ports, used by Wowza, to the local IP of your Wowza machine. In the Wowza Quick Start Guide you can find a list of ports used by Wowza.
To verify that your Wowza installation can be accessed from the internet, open a web browser and try to access this URL: http://[YourPublicIP]:1935. Here is a description on How to verify that Wowza is running.
The web site visitor who wants to see your stream needs to use [YourPublicIP] to access the stream provided by Wowza from your local machine.
If you don't have a fixed public IP, and it may change over time, you can use a Dynamic DNS service such as dyndns who will give you a domain name that will route to your dynamic IP. So, then you would use the domain name they give you instead of your external IP.
I have no Idea how to do that could you pleas make this step by step
I have public IP and have as well Dynamic DNS and my domine but how to do that?
because of my english not good pleas make it easy for me to understand
In order to configure and run Wowza server, you should follow the instructions described in the Quick Start Guide.
If you are connected to the internet from a local network, through a router, you also have to configure that router to forward the ports used by Wowza to the machine that has the server installation. For the router configuration, you should find useful instruction on this website: http://portforward.com