You'll need customer support to do this for you, @Susieq23 . You can contact them below.
When doing this, it's also a good idea to change your Community e-mail as well. You can do that yourself by tapping your Avatar upper right, going down to My Settings and change it there.
To contact a Customer Support Agent, there are 2 methods:
Watch for their response in your Community private mailbox which will be indicated by a number on the small envelope icon to the left of your Community avatar.
@Susieq23 To change your email you need supports help to do this
Getting support / submit ticket
Or while your already here and logged in the community