Begin by going to: http://www.flashforge.com/support-center/flashprint-support/ and clicking 'Download' under the 'Software' heading. You may also download the 'User Guide' which goes into detail about how to use more advanced features of the software.
Once downloaded, you should follow the normal installation procedure. If you have any trouble with installation, or the installation of the drivers for the printer, you may need to seek IT help.
Once you have Flashprint successfully installed on your computer or laptop, you are ready to send your first print!