The long string of letters and numbers you sent me is impossible to remember. Don't you have someplace on your site where I can change my password?
If you had done a little forum search you will have found this link:
http://www.zenphoto.org/2009/03/troubleshooting-zenphoto/#16
Again, Zenphoto does not sent a password! You choose it yourself. Also again, if you got a password sent you used a helper script liek SimpleScripts to install Zenphoto. As said we do not support that. Ask the people who provided that helper script if you have problems with it.
Or are you actually talking about the forum password??? Then you should see your profile name as a link in the header. Click on that or on the "member" below your profile name on posts and you can change your account details.