In order to get more value out of vidIQ, you will need to authenticate your YouTube channel.
After completing this process you will have access to custom recommendations, analytics for your videos, subscriber analysis and more.
Once you've signed up you will be landed on this page: https://app.vidiq.com/welcome
In order to authenticate your YouTube channel:
Click on the button “Authenticate your YouTube channel”.
Sign in to the Google account associated with your YouTube channel.
Choose the channel you'd like to add in to vidIQ
Allow access to your channel by clicking “Allow” button.