There's nothing on FMP 10 to deactivate. Simply install the software on the second machine and enter the license key.
To honor your license and avoid error messages should someone attempt to use the FMP to link to a hosted database from the both machines, you should uninstall FMP 10 from the first machine. Follow the steps appropriate for your operating system to uninstall the software.
I need to move my fm 9.0v3 database to another machine. I did install the FM on the new machine, my question is about the DATA, where I need to copy the Data for the dtabase? I named the server the same name and it will have the same IP address and also belog to the same Domain. I am curious about how link the data with the new machine ?