I need some assistance switching emails linked to my BoldGrid account

Hi, I need some assistance switching emails linked to my account. I had forgotten what email was linked to my boldgrid so I first attempted to log in with staff@drgarypolan.com and when I was prompted to set up an account, I realized this was the wrong email and I tried to sign in with my other email ergonomicsdr@gmail.com — this worked. But now, I’d like to change the emails associated with my account. When I go into settings and try to add staff@drgarypolan.com, I’m told that I cannot because “This email address already exists.” So I need to eliminate the staff@drgarypolan.com account and add that email to the ergonomicsdr@gmail.com account please.