If you want to link a credit, debit or additional accounts to trigger your Rules, you will want to add a bank connection. Head to the ‘You’ tab, tap the banner that says 'Accounts' and select the banner that says, 'Add a bank...' You will then be able to follow the prompts. (The list of banks in the 'Other' list is searchable, so you don't need to scroll through the whole thing!)
Once the account is added, you can activate each one right in the app by going to the 'You' tab and tapping the banner that says 'Accounts'. One at a time, tap the banner for each account and select 'Use account for rules.' Here you can toggle off and on to trigger your Rules. Please note, any accounts activated to trigger Rules will trigger all Rules.