Do the following the reset the password of your email account:
1. Launch your computer/phone browser
2. Visit your email client's email login page (e.g http://mail.google.com
3. Look for and click on the 'Forgot password?' link
4. You will be prompted to enter the email address for which's password you are trying to recover - enter it correctly and click next/submit/done to continue
5. You will be asked further security questions to prove that you are the real owner of the email account - answer all as correct as you remember them and you should finally be allowed to enter in a new password in the place of the forgotten one.