Add steel_crypt to your project level pubspec.yaml:
dependencies:
steel_crypt: ^2.X.X # Fill with latest version
# other dependencies go here
Use pub get or flutter pub get from your project root:
cd my/project/path
pub get
Import steel_crypt in the Dart file where you want to use it:
import 'package:steel_crypt/steel_crypt.dart';
You're all done! Head on over to the docs for usage guides.