Press C at the bottom or press the C key to cast Press R at the bottom or press the R key to reel the line back in When your line starts shaking, you've got a bite!
Sooooo, it's kinda buggy right now, so if you notice anthing that isn't supposed to happen, just tell me down in the comments. DO NOT press C twice, if you do just restart the game, same thing with the R button. Have fun!