The Dropbox Account Setup step appears just before Finish when you choose to save files to Dropbox: Dropbox in Select a Cloud Storage Type (Exact Forms Plus, XL Docs), in Select a Cloud (Document Portal), or as a storage location (JuicedSign).
For what to enter on the step and how to generate the refresh token, see Dropbox setup.
Note
If you need to change your current Dropbox account information with us, submit a technical support case.