Your Instagram Public Data data source then appears in
Sources. It lists the Facebook Pages you manage that have a linked Instagram Business or Creator account; Pages without a linked Instagram account are not listed. During Alpha, Instagram Public Data reports are not available yet. When they are, you will choose which Page's Instagram account runs the lookups and which accounts to track; see the
Instagram Public Data Data Connector User Guide for what to expect.
Removing the source stops Power My Analytics from using your Instagram account to look up the accounts you track.