One of my rowers signed in as someone else and recorded a piece. How do I make sure it’s recorded under the right person?

Go to their piece in the app (where you can see the graph of their result) and tap on the 3 dots in the top right corner. Tap the option “Move to Another Athlete.”

You’ll then be prompted to select the athlete to move this piece to. After a minute or two, overall workout rankings, piece rankings, and PRs will be updated to reflect the change.