If you want to connect your Headspace account with an alternative login option/method (Facebook, Spotify, Apple or Google) please visit https://www.headspace.com/manage-identities.
Doing so will simply add a login option to the Headspace account that has already been created with an email and password. Your email and password credentials will not be overridden, rather you will be able to sign in to Headspace using an alternative method.
In order to disconnect any of the alternative login methods, please send us a detailed note to help@headspace.com.