Contrail has no account to sign into, no server to go down, and nothing to sync — so most support questions come down to one of a few things below. If yours isn't one of them, just write in.
A couple of things that make a reply faster:
Open How Contrail works — tap the ? in the top corner of the Stats tab. It covers trip splitting, home detection, and photos with someone else's location on them (a photo sent to you over Messages or WhatsApp carries a real location just like one you took yourself).
Open the trip and tap Edit — title, journal entry, dates, countries, cities, cover photo, and which photos belong to it are all editable directly in the app.
Force-quit and reopen it first — this clears almost everything. If it keeps happening, write in with the details above; a crash is a bug, not something you did wrong.
At this time Contrail does not have the concept of an account. Deleting the app deletes everything it's ever computed.
Write in — this is a small, actively-developed app, and real feedback shapes it directly.