make a test page of the page you want to put the guestbook on and then you can see if all works with it on your page and more
then if it is you can set your test page to make it your index.html page which is what your homepage needs to be
But you can login to your bravenet account
click on the guestbook
you will see your guestbook display
click on post and post there and see what it does
You posted elsewhere your guestbook didn't fit on your website or such but you gave us NO link to even look at why to help you with maybe picking a different theme that size of guestbook would be different and might have fit
But a reminder the only thing you would be testing here is if your post goes through and such and if you post then you should see it after you post in your guestbook maintenance area
then if you want to keep your post you can if not and want to delete it then you can in your guestbook maintenance area