There are two ways to reset a lost WordPress dashboard password:
Using the Lost Password option
Using Softaculous Apps installer
Using the Lost Password option
1. Open your WordPress administrative login page – it is usually located in http://yourdomain.com/wp-admin.
2. Click on the Lost your password? option, fill out the username or email address > Get New Password: 
3. Log into your email account, which is set as your administrative WordPress contact. You can find the email message with the password reset URL there, click on it:
4. Enter your new strong password twice on the opened page > Reset password: 
DONE
Using Softaculous Apps installer
In order to change the password for your WordPress admin user, follow next steps:
1. Log into cPanel and navigate to Softaculous Apps Installer menu:
2. In the Softaculous interface find All Installations icon in the top right corner
3. In this menu, you will see Scripts Installations list. Select the one you need to change the admin password for and click on Edit Details (pencil icon) next to it: 
4. Next, you will see installation details page. Scroll down to Admin Account section. Here you need to enter your current username and the new password in Admin Password field: 
5. Once done, scroll down to the bottom of the page and hit Save installation details button:
Feel free to log in to WordPress admin panel using the new password
