GLShooter,
You can use the procedures listed in the menu items at the upper left of the form.
First, click on "Main Menu"
Select "Case / Caliber data"
Then click on "Data Add, Change, Load, Save" and select the "Change data records in active file".
The Cartridge Edit form will appear.
Click the small down-arrow at the upper right of the cartridge edit form and select the cartridge that you are wildcatting.( or any cartridge will do)
Change the cartridge name to your new wildcat cartridge name. Edit all values and dimension to your new cartridge and be sure to click the "Add New" button.
Your new cartridge will be added to the bottom of the list of cartridges. (The next time you open the QuickLoad program, your cartridge will be in it's proper place in the listing.
The new cartridge may now be selected just as any other cartridge.
Hope this helps.