Sorry, don't know who you are
But to show list/our price on the category page, this is the original code:
{if $active_modules.Subscriptions ne "" and ($products[product].catalogprice gt 0 or $products[product].sub_priceplan gt 0)}
{include file="modules/Subscriptions/subscription_info_inlist.tpl"}
{else}
{if $products[product].taxed_price ne 0}
{if $products[product].list_price gt 0 and $products[product].taxed_price lt $products[product].list_price}
{math equation="100-(price/lprice)*100" price=$products[product].taxed_price lprice=$products[product].list_price format="%3.0f" assign=discount}
{if $discount gt 0}
<FONT class="MarketPrice">{$lng.lbl_market_price}: <S>
{include file="currency.tpl" value=$products[product].list_price}
</S></FONT><BR>
{/if}
{/if}
<FONT class="ProductPrice">{$lng.lbl_our_price}: {include file="currency.tpl" value=$products[product].taxed_price}</FONT><BR><FONT class="MarketPrice">{include file="customer/main/alter_currency_value.tpl" alter_currency_value=$products[product].taxed_price}</FONT>{if $discount gt 0}{if $config.General.alter_currency_symbol ne ""}, {/if}{$lng.lbl_save_price} {$discount}%{/if}
{if $products[product].taxes}<BR>{include file="customer/main/taxed_price.tpl" taxes=$products[product].taxes}{/if}
{else}
<FONT class="ProductPrice">{$lng.lbl_enter_your_price}</FONT>
{/if}
{/if}
That is not present on the product detail page by default, so you'd need to rewrite the above code using the correct variable for the product detail page, which is $product instead of $products[product]