Please let me know how to correct family information that I know to be incorrect.
@McKenna9, that depends on where this incorrect information appears.
If it's in the collaborative Family Tree, then you can go to the profile's details page and click the pencil (edit) button next to the incorrect information. Make the correction, (technically optionally) write in your reasoning, and click Save.
If the error is in the index of a historical record, then it depends on the collection if and how it can be corrected. Go to the index detail page and check the Edit button in the middle of the black strip at the top. If that button is grayed out, then you cannot correct the index; you'll just have to console yourself that the index served its purpose, despite the error, because you found the record. If the button is available, then clicking it will result in one of two different index-correction processes, depending on the collection. The older one is pretty self-explanatory to use, but is generally limited to editing only the names and maybe the event date and place. The newer one is much more complex, and can be slow, but in exchange, it allows editing of every field, as well as adding or removing fields or entries.