First, create a Bazium Back to Top Button widget on Common Ninja.
On the widgets catalog, find the Back to Top Button and enter the Editor.
When you're done creating the Back to Top Button widget, 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 Back to Top Button widget to your Bazium website, 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 widget embed code. In the next steps, you will paste this code into your Bazium [site_type].
Now, let's head to your Bazium website's editor.
In the Bazium Editor, click on Add Block button, wherever you wish the Back to Top Button will show.
On the left menu, enter Miscellaneous
Select the HTML block.
Click on the new Block that you've added to your page.
Now, in the HTML Code window, simply paste the Back to Top Button embed code you've copied before.
Click the Save button at the bottom of the HTML window to save your changes.