can you remotely turn on find my mac book

No — your original question asked if "you" can remotely turn on Find My; the "you" in that statement implying someone other than its authorized user.

Only an authorized user of that Mac can turn it on, and no, that action cannot be accomplished remotely unless the Mac is remotely managed through MDM or some equivalent service.

Read If your Mac is lost or stolen - Apple Support for actions that you can take after it has been stolen.

Find My can be turned on only by authorized users of that Mac.

Add your Mac to Find My - Apple Support