My webhost gives you two URLs for your website:

1. The URL on your shared server, which is something like usr283725992783.mywebhost.com and 2) your domain URL, which is www.mywebsite.com

Google is indexing both of these URLs, but obviously I only want www.mywebsite.com to be indexed.

I can't add "no follow" tags to "usr283725992783.mywebhost.com" because that URL serves the same files as www.mywebsite.com.

How can I only make Google not follow usr283725992783.mywebhost.com and keep following www.mywebsite.com?

My webhost gives you two URLs for your website:

1. the URL on your shared server, which is something like usr283725992783.webhost.com and 
2. your domain URL, which is www.example.com

Google is indexing both of these URLs, but obviously I only want www.example.com to be indexed.

I can't add "nofollow" tags to usr283725992783.webhost.com because that URL serves the same files as www.example.com.

How can I only make Google not follow usr283725992783.webhost.com and keep following www.example.com?