The "envelope create" wizard can be opened using the green button "NEW DOCUMENT" in the menu bar on the left side, or by using one of the tiles on the dashboard which create a new draft.
Beside the options which create a new draft from scratch, following actions open the Envelope Create Wizard:

The Envelope Create Wizard consists of minimum 3 pages, and can be extended by additional customer-specific pages. We will have a look on the different pages in following sub chapters: