@Amanda_FUNYL, It’s in settings>deals>setup>customize create deal form.
You can likely use the url below but replace your HUB ID number where it says “insertyourhubIDhere”
https://app.hubspot.com/object-manager-settings/insertyourhubIDhere/creator-editor/0-3
The UX design has changed slightly since I made that brief video above. Here is a new new one. Hope that is helpful! Feel free to reach out if I or Raka can help some more!