First you need to create a ship using as many credits that you can, the more you use the easier this trick will be. After your ship is built use the "Export Ship" function under the Fleet Heading. Once you have done this, go to the Main screen and enter a new "Admiral" name. Then use this new name and go to the fleet screen once again. Once there, use the "Import Ship" function to import the ship you created. Once it is in this new fleet, decommission it and the value of the ship will be credited to your buying funds. Keep Importing and decommissioning the ship that you created and your buying funds can go through the roof. I stopped at 1 Million credits.