So I bought a used I watch and don't have the Apple ID or password, what do I do?

Hi

Activation Lock prevents unauthorised use of Apple Watch if it is lost or stolen.

To be able to pair the Apple Watch to your own iPhone, you would need the previous owner (who may not be the seller) to either enter their Apple ID and password on your iPhone or to turn the feature off via https://www.icloud.com/ (by signing in with their Apple ID > Find My iPhone > All Devices, then select the Apple Watch > Erase Apple Watch > Next until erased > click X next to the watch).

If you cannot arrange for the previous owner to do this, then you should, if possible, return the watch for a refund.

You will not otherwise be able to use the watch. There is no way around this security feature.

Apple will not advise you of the previous owner's contact details, nor will Apple pass your details on to them.

More information:

About Activation Lock on your Apple Watch - Apple Support

If you device is 'Activation Locked' review/read:

• You must have access to the Apple ID that is locked on the device. The device might display the Apple ID as 'e*****@gmail.com' which is a reference to the Apple ID locked on to it (but it's not accurate to it length for security and privacy reasons). If you don't have the Apple ID access then you must contact Apple Support or an Apple Store with a proof of ownership to unlock the device, but you'll won't be able to ever use the Apple ID again (which includes backups).
• More Help:
  • About Activation Lock on your Apple Watch - Apple Support
  • If you forgot your Apple ID - Apple Support
  • If you forgot your Apple ID password - Apple Support

If you can not get access to the account or a proof of ownership (some sort of receipt) then they well not remove this. Also since it used sounds like you may not be able to do this, so try getting a refund, or contacting the person.