Just open your website wordpress dashboard, go to the Editor Tab under "Appearance" and click on Footer.php file. Then look for the following code:
<a href="<?php echo esc_url( __( 'http://wordpress.org/', 'bre-bootstrap-ecommerce' ) ); ?>" title="<?php esc_attr_e( 'Semantic Publishing Platform', 'bre-bootstrap-ecommerce' ); ?>"><?php printf( __( 'Running %s & <a title="Boot Store theme" href="http://extend.thecartpress.com/products/boot-store/">Boot Store theme</a>', 'bre-bootstrap-ecommerce' ), 'WordPress' ); ?></a>
Delete everything between the <a> and </a> then just insert whatever footer words you want such as: Copyright 2014 - Business Name
Click "Update File" and that's it. You will have deleted the Footer Credit and inserted a non-clickable Copyright (or whatever) notice. If you still want to leave credit to Boot Store, then just put in "Boot Store Theme" where I mentioned that you put your Copyright notice.