Then attach your Sources/Subs.php file here.
Or try under your Sources/Subs.php file
Find
'mlist' => array(
Add Before
// Begin SMFShop code
// !!! Add subactions?
'shop' => array(
'title' => $txt['shop_menu_button'],
'href' => $scripturl . '?action=shop',
'show' => true,
),
// End SMFShop code