To join the curation trail, you fist need to sign up to hivesigner.com.
First sign up using your private posting key, then sign up again with your private active key.

Next, go to hive.vote
Login using hivesigner.com
Give hive.vote authority to perform actions for your account
Next, in hive.vote , navigate to curation trail, then search for cleanplanet without the "@" symbol.
Next, click follow then settings. Set the voting weight to a range of 80-99 and click save.