When you are ready to charge your drum, hit the ‘COUNTDOWN’ button in the top left of the RoastPATH Window and RoastPATH will give you a 3 second countdown to release your greens from the hopper to the drum. For more information about Events, see the article Events: Marking, Unmarking & Moving
Note: With the release of RoastPATH v1.7 the 3 second Countdown is now an optional setting. In addition, v1.7 can automatically detect Charge on compatible roasters. For more information about RoastPATH v1.7 and roaster compatibility see the v1.7 announcement on the RoastPATH Forums RoastPATH v1.7 Release - Features and Improvements and the article Is my roaster Roast Replay ready?