It sounds like you’re looking for a guide to Rocketpult Unblocked — likely a version of the game that can be played on school or work networks where gaming sites are blocked.
Install the Ruffle browser extension (Chrome/Edge/Firefox). This emulates Flash automatically. Then visit archive.org’s copy of the original Rocketpult. Ruffle will boot the game without asking for plugin permissions. rocketpult unblocked
Unlike many "launch and forget" games, Rocketpult requires active participation from the moment of ignition until the final landing: It sounds like you’re looking for a guide