Go to https://my.ncahec.net/login.php. Click on the 'MY TOOLS' tab. You will be sent to the login page. In the login box (under the submit button) you'll find a link that reads 'Forgot Password?'. Click on this link and enter the email you used to create your MyAHEC account and the system will reset your password and email it to you.
Copy the password on the email and paste it into MyAHEC to gain access to the system. MAKE SURE there's no spaces neither before nor after the password copied from the email since it will cause an invalid password error.
If later on you decide to change this password, you can click on the 'MY ACCOUNT' tab and then on the 'Update Password' link on the left navigation.