Please make sure you have logged into Notifia via the Wordpress Plugin Installation. This way, we can identify the Wordpress Site your account is linked to.
Once this is completed, you can visit your Website, and press perform a hard refresh.
This makes sure you are loading the most recent version of your Website, with the Notifia Pixel installed.
You can then head back to the Notifia Dashboard, and see that your Pixel is correctly installed.