When I put the ip of my srvr y see another server that y dont know help plese

Are you using a server hosting solution such as heavynode/mcprohost/etc?

port 8123 is likely taken by another server and you will have to request another port to use for dynmap then specify the new port in configuration.txt

yes i dont know how to solicitate a new port

You will have to contact your server hosting provider to get a new port.