@GL4202 welcome here!
Do change your sparkplug are two ways to approach it:
- underseat bucket out and you see down there on the scoots LH motorside a sparkplug cap with a cable attached to
- pry off this cap, take a proper sparkplug spanner and get her out
- second approach, if you are willing you lay down close to your scoot
- scoot on mainstand, look from beneath at mentioned cap, get it out
Maybe you go to Youtube and watch some videos on this subject
Feel free to ask further, good luck!