Email support@chasurasolutions.com and we'll reply within a few working days.
It helps to say which phone or browser you're using, what you expected to happen, and what happened instead. A screenshot is worth a paragraph.
Create your household, then add an account for each thing you own or owe: current accounts, savings, ISAs, pensions, investments, property, credit cards, loans, car finance and mortgages. Each one needs a starting balance and the date it applies to. Your net worth appears as soon as the first account is in.
Go to More → Household and tap Share invite link, then send it however you like. Whoever opens it can create an account, or sign in with one they already have, and they join your household. Everyone in a household sees all of its accounts, balances and transactions.
Use Update balances from the Dashboard: it lists every account on one screen, so a month's updating takes a single pass. Anything you haven't updated for 60 days is flagged so it doesn't quietly go stale.
A balance you enter is treated as the truth for that day, so transactions dated before it are assumed to be included in it already. A transaction added after you save a balance counts on top of it. On a credit card or loan, Spent adds to what you owe and Payment or refund takes it off.
Yes. More → Backup & export gives you an Excel workbook, CSV files, or a full backup you can restore from later. In the app they open in the share sheet, so you can save them to Files, Drive or email.
No. You enter balances yourself, so nothing is read from your bank and Clanfolio can never move money. Accounts in other currencies are converted to your household's currency using rates you can see and override in More → Currency.
Only your household's own figures, which is what it answers from. It can't invent a number, and it doesn't give financial advice.
Deleting your account explains what goes with it and how to ask if you can't get into the app. The privacy policy covers what Clanfolio stores and who processes it.