Yes you can change your email.
Go to your profile (you would see it above)
Then go to account related information.
Then change your email.
But most time it’s quite suspicious for an account to change email we never can tell if the account was hacked and the culprit wants to change email. So many people would have different views on the situation.
Technically, yes you can change your email address anytime and there are no restrictions on changing it any number of times.
However, since changing of email and sometimes password too suspects that account might have changed hands. So to be on the safe side, you can sign the message to prove the ownership of the account. You can only do if it is required by someone, not a compulsory thing with changing the email address of your profile.