Code Signing Error - iOS Run Device

How do you rectify this? I am using Atom, not Xcode - can I load this project into Xcode somehow?

=== BUILD TARGET xxx OF PROJECT xxx WITH CONFIGURATION Debug ===

Check dependencies
Code Signing Error: Signing for “xxx” requires a development team. Select a development team in the project editor.
Code Signing Error: Code signing is required for product type ‘Application’ in SDK ‘iOS 11.4’

** ARCHIVE FAILED **

The following build commands failed:
Check dependencies
(1 failure)

[OK] Your app has been deployed.
Did you know you can live-reload changes from your app with --livereload?