In your DirectAdmin web hosting control panel, find the E-mail Accounts icon in the E-Mail Manager section of your control panel:
This will show you a list of all of the email accounts set up on your account. Find the email account you are wanting to change the password to:
Then find the + on the far right side in the corresponding row for that email account:
Click this + sign to bring up the submenu. Click Change Password/Username:
A new dialog box will pop up. From here you can enter the desired new password for the email account:
Or you can use the random password generator on the left side of the Password textbox to generate a random new password:
Click Save to update the password information for this email account.
An E-Mail Updated dialog box will pop up to confirm that the password for the email account has been changed: