Do you want to send your Scans via Email and keep receiving an error message that says: "Please Configure your Email Account in Settings" ?
Scanbot always tries to send emails with the default native iOS Mail app. Please note that this app has to be configured in the settings of your native 'Mail' app on your iPhone if you have not done so before.
Just open the Mail app and add your email account. Afterwards you can use Scanbot to send your documents via email.
Official Apple help page:https://support.apple.com/en-ph/HT201320
Other emailing apps, for example Gmail for iOS, can be used by choosing the 'Share' functionality.