Login to your account that is associated with your hotspots via Helium World. Once you are logged in and viewing the homepage, head to the Hotspots tab.
At this point you should have a searchable list of all of the Hotspots associated with this account.
Find the Hotspot that you wish to transfer to a different owner and click on its listing, you will be presented with the Hotspot overview, along with your management options, click on the gear icon and select Transfer Ownership
Confirm the hotspot details of the unit you will be transferring
Lastly just enter the wallet address for the new owner of this Hotspot, and confirm your transaction and head back to your dashboard.