[robg]

Have a look in the Customer Main Products_t.tpl in templates. Find the following code and remove the comments:

{*** Uncomment it if you need 'Buy Now' button ***
{if $usertype eq "C" and $config.Appearance.buynow_button_enabled eq "Y"}
{include file="customer/main/buy_now.tpl" product=$products[product]}
{/if}
*** Uncomment it if you need 'Buy Now' button ***}