Hi!
I see, thanks for explanation.
In this case, you need to add a simple mod that will add Facebook Like button to the home page. If you want to do that yourself, you need to create an empty module as described here:
http://kb.x-cart.com/display/XDD/How+to+create+a+module and let me know your developer and module ID.
Then, I will suggest what to do next. Basically, you will need to add a new template according to the article here:
http://kb.x-cart.com/display/XDD/How+to+insert+your+HTML+code+into+any+part+of+the+ page#HowtoinsertyourH...odeviatemplate
If you struggle with this part, please let me know and I will be able to help.
Tony.