Log into your StableHost cPanel account. If you don't know how, read this article first.
Once logged in, go to the "Softaculous App Installer" section and click on the Wordpress icon:
You will be redirected to a new page, click on "Import":
Click on "Auto Detect all installations":
Click "Start Scanning for installations":
You will get a successful message after a few seconds:
Now, if you want to manage your WordPress install, click here for the correct guide.