I don't see the tab on my facebook page

I followed the instructions but I do not see the tab on my facebook page.  What do I need to do to fix this?

I assume you're referring to embed your form in your Facebook page. Please, check this guide where you will find more  details about it: Adding-a-Form-to-Your-Facebook-Page

I have just tested it and worked fine: 

Do let us know how it goes on your end.