After plugin installation you need to configure it to make it work.
First log in as administrator and go to “Manage apps” (1). Then go to Docusign Credentials (2). After that go to DocuSign and get API Account ID (3), Integration Key (4), Secret Key (5), you can check how to get it here: DocuSign initial setup
Once you obtain API Account ID (3), Integration Key (4), Secret Key (5) from DocuSign fill it as marked on below screenshot and press “Save” (6):
Your app now is initially set up and it is ready to use, to check exact meaning of every configuration option and customize app to fit your needs you please check: Jira advanced configuration