Well, I am the original owner. I created this account in about a year ago. That time I couldn't be active due to some personal matter. But now that I'm totally free, I wanna dedicate my time to learn more.
p.s: The email is unchanged, I just had to reset the password several time due to the custom ROM testing.
You are free, and no one is against you changing your password because, as you indicated, it is for security reasons.
When an account activates and appears suspicious, or the manner of posting and interactions in the account changes, reputable forum users usually use the password changing time as evidence to show the user wrong or to protect the account from being utilised by a hacker.