On your own profile, you can hide the answers your friends have given if you want to (for example, if they’ve written something really silly 😄). Just go to your profile preview, press and hold on an answer, and you can easily hide/delete it. The person who wrote it will also get a small note in your friend chat that the answer was hidden.
If you’re a matchmaker for someone else and want to change your answers about them, you can go to your friends' page and click on "change answers." There, you can redo all the questions. For text-based questions, you can also just press and hold on your answer in the profile.