You would set up your schedule. Mark your jobs as completed as you go. At the end of the month you would click the "Generate" button and generate your invoices. Generating invoices means that Gopher will take all your completed jobs located in the Schedule page under the completed jobs tab, and it combines them into invoices.
Once you have made your invoices for the month you can go to the top left of your Gopher program click FILE | Quickbooks Link | Export To Quickbooks.
Choose the date range of invoices you want to export to QB and click the Export button.
Run your QB program and click on FILE | UTILITIES | IMPORT. Where it says select IIF file hold your CTRL button down and hit V to past the file name.
Let me know if you have further questions