I lost my email access, can I change my account email? If I make a change, will it affect my account?
Email can be changed as you see people taught you.
But you can prove account ownership with password, signed message from your Bitcoin address. Did you sign any Bitcoin message with your address on Bitcointalk?
If you signed it already, you can change your email address and if you need to prove account ownership, you can sign a new message from old address you staked.
How to sign a messageStake your Bitcoin address here