You need to perform a new scan if you accidentally detached the WordPress website and want to reattach it from the WordPress Toolkit.
Below are the steps on how to add the WordPress website from the WordPress Toolkit
Step 1: Log into your cPanel.
Step 2: Click on the WP Toolkit option on the screen's left side.
Step 3: In the WP Toolkit window, go to the Installations tab and click on the Scan button to scan the WordPress site. It will automatically detect WordPress installations in your cPanel account.
Step 4: Upon completion of the scan, all WordPress installations from your account should appear, ready for management.
Note: It is essential to unlink your WordPress installation from the Softaculous WordPress Manager if you installed WordPress using Softaculous 1-click install.
That's all.