Hello Guillermo,
Exactly, this is the one you may want to edit. Button is coded in HTML here:
a href=”http://www.fantasticus.nl/sandbox/” class=”btn btn-lg btn-primary”>Agenda
You can easily change Agenda for Home, and when moving your site from sandbox to live domain, you should change the URL to the live one.
I hope that above is useful to you.
Thanks,
Piotr