Thanks for your question about having your own domain name with BoldGrid. BoldGrid is a plugin based system that works through WordPress. The trial version you’re mentioning is exactly that – a sample version used to see how BoldGrid works. When you obtain a license, you would be able to use it in a normal installation. You would simply need to have a host and install your WordPress site using your domain name. Then you would load the plugins and apply the license key.
I hope that helps to answer your question! If you require further assistance please let us know!