If it says in your panel that a campaign is pending statistics, it means that it is time for you to send the statistics of your publication.
Accessing Instagram statistics is very simple, here’s how: first, go to your profile, and in the upper right corner you will find the menu (three horizontal bars). Click on it then click on 'insights' or 'statistics'. On the first screen, you will see your posts. If you click on 'see all,' you can filter by time and see the statistics for each post.