There is extensive online documentation, start with this link to What is Dewey Data.
Click on Data Partners to see documentation for individual datasets.
This video tutorial walks through the basics of using the platform.
Dewey Data's API is the most efficient way to access data. Dewey provides support for Python and R on their GitHub site.
Dewey runs a community support forum. Enter the email you used to register to receive a login link.
This can be accessed without logging in, but that won't allow you to post questions.