@bimbo
And still you just complaint and cannot read what is in plugin configuration:
Hook Button to Item Page
"Send Message" button will be shown on listing page without need of theme modifications.
For sure you have turned this on ... or ... you have already placed link into your files
Then you place link again and complain that it is shown twice.
If you are smart person, first you will go trough plugin configuration, read all instructions here and then you will ask something.
What are you going to complain on paypal? We have delivered product that exactly match it's description and is fully funcitonal.
Where you found functionality "hide to unregistered"? So it is your custom requirement? Yes it is.. then if you are not satisfied what you got for free, you can hire developer to setup your page.
Locking this thread as original question was already answered.