In the app Settings add an email address for parsing. All flights that are recognized will be added automatically to your flight feed. .
The IMAP option is for accounts with custom domain names, or are for iCloud. Note: If you want to parse flights from your iCloud email, connect it via IMAP, not the iCloud button.
Go to Settings.
And connect your IMAP/Gmail/Outlook etc. accounts.
Go to Settings and tap on "Import flights" button.
Now you can connect your account.