You can change the personal details (email address or phone number) you use for your Arke account by visiting http://identity.arke.io.
Login with your details and from there, you will have the option to change your email address or phone number.
When you change your email address, you will need to enter the verification code that is sent to your new email address.
When you update your phone number, you will need to enter the verification code that is sent to your new number.
Note: if you update your phone number in your Arke account, you will need to speak to your estate manager and make sure they update the phone number on the estate's system too. You will not be able to use Arke until your new number has been loaded into each estate you use.