How to change magento admin password through phpmyadmin ?

It seems like the password must be typed and not copy/paste at least on the install part. good to know ;o)

The default login is : admin The default password is : 123123
If you are having troubles and want to reset it to a different password, just run at your sql database:

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SELECT * FROM admin_user;

Then, find the username you want to modify in the listing provided – ‘admin’ in this example. Then, to update the password, type:

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 UPDATE admin_user SET password=CONCAT(MD5('qXpassword'), ':qX') WHERE username='admin';

‘qX’ would be changed to whatever you want it to be and same goes for ‘password’
You can also do this in phpMyAdmin, find the admin_user field and choose MD5 when updating password.
If you want to add a new admin user, you must not only create a new entry in the table ‘admin_user’, but you also have to insert an entry in the table ‘admin_role’ which has to be associated with the user by the field ‘user_id’.