Your question is a little non-specific, but I'll hazard a guess...
To change the e-mail address that's registered with your Instructables account, go to You --> Settings(or try the link below):https://www.instructables.com/member/djuniper/settings
If you want to change your actual e-mail address, the process will depend on your e-mail provider.
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Goto your page ==>
You can change a lot of things there including your email account.
Ahh. Open a new one with your preferred ISP and then tell everyone.
I am missing something here aren't I.