If you are represented by patent counsel, this is a matter you should discuss with your counsel (and it would be inappropriate for us to respond).
If you are not represented by counsel, let us know and we can provide some general guidance -- though we will ultimately encourage you to retain counsel who can look at your patent application and website and give you more specific advice.
Good luck to you!
Any conspicuous place is fine. Generally, if you have a product, the term "patent pending" should be on the product itself. If your product is a web site or web service or something, then I would put it in the "about" page somewhere.
There is no real magic place that it should be. It should just be conspicuous.
The phrase "patent pending" is often quite misleading. There mere fact that you filed a patent application does not mean that you have acquired any substantive rights---until a patent actually issues you have nothing except a patent application. A mere patent application gives you no rights, whatsoever. Thus, it might be appropriate for you to say that a patent application has been filed, but it is usually inappropriate and misleading to use the phrase "patent pending". And if you do say that a patent application has been filed, you should make clear that until the application is reviewed by the U.S. patent office, there can be no assurance that you will succeed in obtaining a patent.