After registering the client and configuring it as specified below, ___________, visit https://api.instagram.com/oauth/authorize/?client_id=`CLIENT_ID`&redirect_uri=`REDIRECT_URI`&response_type=token then get redirected to http://localhost:3000/callback#access_token=ACCESS_TOKEN where you can copy the actual access token from the end of the url.
Security > Valid Redirect Uris: http://localhost:3000/callback
.
Security > Disable implicit OAuth: False
(Un-checked).