Use the Otto Installers on each of the servers that will be involved in the migration. Your license provides for three: Development, Staging and Production, for example. The Otto installation instructions can be found here.
Defining the Servers in Otto Migrator
Using - Fully Qualified Domain Names
It is highly recommended to enter fully qualified domain names for your server, ie myserver.mydomain.com. This will allow for a secure connection.
You may select one of the provided server labels: development, staging or production or use any descriptive label for your servers.
Here is what the server details look like when you've completed the server setup wizard
The next step is to specify the Migration Details