[qualiteam]

Assuming you use 4.4.x, you should alter the "skin/%SKIN_DIR%/customer/main/order_message.tpl" template and change href in the following code fragment:

<div class="buttons-row center">
      <div class="halign-center">
        {include file="customer/buttons/button.tpl" button_title=$lng.lbl_continue_shopping href="home.php" additional_button_class="main-button"}
      </div>
</div>

Note: %SKIN_DIR% - e.g. vivid_dreams_chromo or common_files depending on the used skin.

http://help.qtmsoft.com/index.php?title=X-Cart:Editing_Skin_Files