Further help is indeed needed. Once all the info in the 'Manage Clients' panel is entered, and the Client ID, Client Secret, and Redirect URL are pasted, I click 'Save Settings', and then click 'Instagram Login' below that. This takes me to the authorization page on Instagram.com, and I click on 'Authorize'. It then redirects to the WordPress login page, and when I login to my dashboard, it doesn't continue the redirect to the Easy Instagram settings page.
Because this is broken, the settings page never updates with the User ID #, and the plugin widget won't work. I even used a separate service to find my Instagram User ID, but it still doesn't work.