How to transfer a Helium hotspot to a new owner
As the Helium network continues its build-up process, you may find you have miners you no longer need due to crowding in your hex, or you have another reason for selling or giving away a Helium hotspot that has been used. The good news is that transferring ownership is easy.
The Helium web site has a step by step guide with screenshots.
You can also find an array of videos on YouTube to assist with the process.
Note that the Helium wallet address is different from your 12 or 24 word seed phrase. Never give your seed phrase to anyone or ask anyone for theirs.