Login/Register Joomla Site with JomSocial

What we have is J2.5 site with template ([login to view URL]) from Shape5 and JomSocial (for J2.5) installed. As you review the template, you will notice the "Login" and "Register" on the template (above "Timescape Video). These are core joomla modules that are populated via iframe. What needs to be accomplished - to install a login module for Jomsocial and figure out "Register" button to populate Jomsocial registration. Once user has logged in, the button "logout" is populated. Basically, joomla core registration has to be disabled and engage jomsocial login/register only. Someone who knows PHP and registration process in joomla 2.5 and jomsocial - this should be a fast-to-complete project. We are not-for-profit and have a small budget.