First, create a BigCommerce Count-Up Clock app on Common Ninja.
On the apps catalog, find the Count-Up Clock and enter the Editor.
When you're done creating the Count-Up Clock app, click on the Save Changes button at the right top corner of the editor.
If you don't have an account on Common Ninja, you'll have to register first.
When you're ready to add the Count-Up Clock app to your BigCommerce store, click the Add To Website button at the top bar of the Editor.
On the window that opens, click the Copy Icon to copy the app embed code. In the next steps, you will paste this code into your BigCommerce store.
Now, let's head to the BigCommerce editor.
On the Left panel, select the HTML widget.
Drag and place the HTML widget on your page, wherever you wish the Count-Up Clock to show.
Now, simply paste the Count-Up Clock embed code you've copied before in the HTML Code window on the left panel.
Click on the Save HTML button at the bottom of the HTML code.
Click the Save button at the top right corner of the page builder, to save your changes.