Hello, the tabs should be automatically activated after you set up the theme, they are attributes that every product has and you can complete them.
We checked your product page and it’s desaligned, did you modified css?. Be sure to set up the theme in System > Configuration > Desing and NOT in System > Desing, this could be the cause of this issue.
Check if you have this code in your catalog.xml :
<action method="addTab"translate="title"module="catalog"><alias>upsell_products</alias><title>We Also Recommend</title><block>catalog/product_list_upsell</block><template>catalog/product/list/upsell.phtml</template></action>