I don’t know either 
But there’s no code included in this setup you can do all these in the editor.
You may want to add product id to your form though and you have to pull that value from the dynamic page itself. Else it would be a random data coming from a random location.
Let’s say this is a product and the form is to collect interest from customer.
In order to do that you will need to display the title or the name of the product somewhere on your dynamic page as it is connected to your dynamicDataset (Database1)
You just need this code to do that
$w('#your2nddataset').setFieldValue('#fieldKeyAsIn2ndDatabase', $w('#yourproductname').value);
your2nddataset: is the dataset where you will be collecting this information (id of your 2nd dataset)
fieldKeyAsIn2ndDatabase: is the field where you want this data to go. (In this example you may want to add a new field and name it as product so whenever someone fills out this form you will know which product this form is about)
yourproductname: is the element where you show this product (title-name-id whatever you name it) on your dynamic page. It is connected to your dataset1 as title-name-id etc. you set it.