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You probably should not delete your old account.
Please see https://help.geni.com/hc/en-us/articles/229702707-How-do-I-update-t... and/or https://help.geni.com/hc/en-us/articles/229702907-How-do-I-update-t... and/or https://help.geni.com/hc/en-us/articles/229702987-Why-can-t-I-login-
Click on your name at top right of screen to get a drop down menu
Choose Account Settings
Then under My Account choose
Email & Password update your email and password
You first ADD your new email address as an additional email.
Then delete the old email address
Important - it has to be done in that order!
See illustrations in top link Job gave:
https://help.geni.com/hc/en-us/articles/229702707-How-do-I-update-t...