Here's a short step-by-step guide:
1. Go to your Gen/ZH folder, and go to Data/Scripts.
2. Make a backup copy of SkirmishScripts.scb and MultiplayerScripts.scb.
3. Open World Builder.
4. Go to Edit -> Edit Player List.
5. Click 'Add Skirmish Players', then click OK.
6. Go to Edit -> Scripts.
7. Uncheck 'Auto Verify', then click 'Import Scripts'.
8. Select Data/Scripts/SkirmishScripts.scb as the file to open.
9. Do your editing.
10. When done, click 'Export Scripts'.
11. Select all the checkboxes, then choose the 'Export All Scripts' option.
12. Click the (hardly visible) OK button, and select the file to save as.
13. Done.
