First, create a WordPress Social Proof plugin on Common Ninja.
On the plugins catalog, find the Social Proof and enter the Editor.
When you're done creating the Social Proof plugin, 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 Social Proof plugin to your WordPress 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 plugin embed code. In the next steps, you will paste this code into your WordPress website.
Head to your WordPress admin panel, and in the page, post, or plugin you wish to add the widget, use the content editor to add a new block.
Click on the Browse All button, to see all the Block types.
Select the Custom HTML Block type.
Now, in the Custom HTML block, simply paste the Social Proof's embed code you've copied before.
Click on the Preview Button
And that's it! Now the Social Proof will appear on the page.