I know you're just starting with lite-C, but the searchable manual answers this question in 1 second. Write "set(my,SHADOW);" in the player action. The default shadow is a decal shadow, you may or may not want to have stencil shadows or even shadow mapping/ PSSM (see manual).
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual
