To set the default values to your form follow the steps below (also shown in the video):
Go to My Forms
Select the form you want add the default values to (on the left)
Click the Customize button
Type your value directly inside the form field
This will be a default value for all submissions created with this form.
An example of this would be if you want to add your company information statically as a default value to some of the fields at the creation of a submission. This is typically info that is not change from customer to customer.
Note: This is not the same as the Import Previous Submission action.
Fields that do not allow default values to be set:
Signature Field
File Upload Field
Customer/Site Fields
Task Scheduler Field