Via Softaculous
1. Log in to Cpanel
2. Scroll down to the Software section and click on the Softaculous Apps Installer.
3. On the Softaculous page, click on the Installations box.
4. Navigate to the Installation that you wish to edit.
5. On the right-hand side of the row, click the Pencil icon to load the Installation Details.
6. Go to the Admin Account section on the Installation Details page.
7. Enter the Admin Username and Admin Password for which you want to change the password.
8. Scroll down to the bottom of the page, and click on Save Installation Details.