For logos:
Just replace wanted following images:

• admin-assets/img/custom/logo-system-mini.png
• templates/bootstrap2-responsive/assets/img/logo.png
• templates/bootstrap2-responsive/assets/img/partners/winter.png

More details about logos: http://iwinter.com.hr/support/?p=168

Contact details:
Admin->Settings->Change Address Footer

Social buttons:
Admin->Settings->Design template->Change Facebook or Social code

For social buttons, you can generate code on this service: http://www.addthis.com and paste code there to textarea…

Links?
Other customizations can be changed in template file, for example:
templates\bootstrap2-responsive\components\footer.php

Left logo in footer?
templates\bootstrap2-responsive\components\footer.php, line around 6:

<img src=”assets/img/logo.png” alt=”Logo footer” />

Image file: templates/bootstrap2-responsive/assets/img/logo.png

Right logo in footer?
templates\bootstrap2-responsive\components\footer.php, line around 37:

<a class="developed_by" href="http://iwinter.com.hr" target="_blank"><img src="assets/img/partners/winter.png" alt="winter logo" /></a>

Image file: templates/bootstrap2-responsive/assets/img/partners/winter.png

In script version >= 1.5.6, different files:

templates\bootstrap2-responsive\widgets\footer_share.php
templates\bootstrap2-responsive\widgets\contactus.php
templates\bootstrap2-responsive\widgets\footer_logo.php