If you cannot use your WordPress password to login to backend, you can reset it directly in phpMyadmin.

See how to login to control panel and phpMyadmin

• How to login to control panel
• How to access phpMyadmin

Once you have accessed to phpMyadmin, select your database in the left and click “Browse” at wp_users table

At the row of user click “Edit” and at Field user_pass, Select Function = MD5 and enter your login password.

Then try to login to WordPress backend again using your password that you have reset.