Joomla
Using any MySQL admin tool, (PHPMyAdmin), run the following query, entering your own choice of password:
UPDATE jos_users SET password = MD5("new-password") WHERE jos_users.username = "admin";
If you’re using a different username to admin, change as appropriate.
If this doesn’t work, try changing jos_users to mos_users.
WordPress
If you know your username and the email account in your profile, you can use the “lost password” function –
If you can’t use this method, here’s how to do it in MySQL.
Using any MySQL admin tool, (PHPMyAdmin), run the following query, entering your own choice of password.
UPDATE wp_users SET user_pass = MD5("new-password") WHERE wp_users.user_login = "admin";
Notes: You must have access to your database. If you don’t, pass these instructions on to someone that does.