To change your admin password for WordPress inside PHPmyAdmin, please follow these instructions.
1: Login to CPanel
2: Click on PHPmyAdmin
3: A list of all databases will appear, click on your WordPress database.
4: Once the list of database tables appear, click on wp_users
5: Click on the browse icon
6: Locate the username under user_login
7: Click EDIT (it may look like a pencil in some PHPMyAdmin versions)
8: Overwrite the password (may look funny due to being encrypted)
9: In the dropdown menu and select MD5 (this will encrypt the password)
10: Click the submit button (may be labeled GO)
Now check to see if you are able to login to the WordPress admin section. If not, please make sure that you have gone through all these steps correctly.