How can I apply for OCBC scrip dividend for all future dividends?

I've read that compound interest is powerful but i don't haven't found any platform that easily allows me to do that. I read in one article of scrip dividend and think this sounds like it will enable me to get compound interest. If yes then how would i do that as i already own some sick in OCBC in my CDP. And if other stock always this. I do far own Sheng shiong, DBS, Capitaland mall trust and OCBC. Is there others that allow me to practice compound interest? Thank you.