How do I write defaulting and validation rules for the create and edit offer flows in Redwood?

1. Navigate to the Redwood Job Offers list page.
2. Right click the page then click Inspect to open the developer tool window.
3. Click the Edit Offer action of a job offer from the Job Offers list page.
4. In the developer tool, click the Network tab and type Createorupdate in the search tool to find the Rest call.
5. Note the submission ID from the Response tab.
6. Select the Edit Visual Builder Studio task in the Settings and Actions menu.
7. Select a project or create a new one.
   Visual Builder Studio opens and you land on the Activity Center screen by default.
8. Go to the top left menu and search for the Create or Edit Job Offer page.
9. Click the arrow next to the Live button to open the Set Page Properties panel.
10. Enter the submission ID you noted earlier and click OK.
11. The Create or Edit Job Offer page is displayed. Click the Configure Fields and Regions button to write business rules to show or hide fields and sections.