Removing subdomain from search engines

[sperko]

I have linked my subdomain to many places around the web as it was used for old projects but have since created a parked domain and my site is now focused on something else

How would I go about completely moving my account or hiding my subdomain/changing it? I want to still be able to use the subdomain but I will not post it anywhere and all access will be through the parked domain

thanks