First way (the easy one)
- Go to your WordPress Login page (something like http://mydomain.com/wp-login.php)
- Click on the Lost your password? link
- You will be taken to a page to put in some details. Enter your username or the email address for that account.
- Wait as your new password is emailed to you.
- Once you get your new password, login and change it again withe the one you like
Second way (a little bit less easy)
- use phpMyAdmin to access and manage the db of your WordPress site
- look for wp_users table
- click on the icon for browse
- locate your username in the user_login field
- click edit for the selected record
- Next to the user_pass is a long list of numbers and letters (it's your old password, encrypted and so unrecoverable)
- Select and delete these and type in the new password you want to use. Just type it in normally, but remember, it's case-sensitive!
- On the near "function" attribute of user_pass field, select MD5 from the menu
- Click the 'Go' button to the bottom right.Test the new password on the login screen.
- If it doesn't work, check that you've followed these instructions exactly.