To enroll in a DRIP for a new position, log in to your account at schwab.com. Go to the Trade tab at the top. Then, select Stocks & ETFs. Below, you'll place an order.
I have not logged into my Schwab account in years ever since TDA is gone. I had ZERO balance in there but have stocks that are petrified LOL. 3 or 4 company's that can't be sold. LOL I don't even know what has been happening with that account.