Modifing product pages

hello. where can i modify my product page. where is this page at and what other pages is it composed of?
and also, how can i remove the serch box in the header?

The search box in the header can be switched off in the Admin Layout Boxes Controller (on the Tools menu).

Changes to the product info page can be made either in the Admin (if you want to toggle on or off the information displayed on the page, or in the pages template file tpl_product_info_display.php and your stylesheet if you want to rearrange the layout and appearance.

thank you for your answer. i realize now that i don't know the zones on a zen cart page. in my limited understanding zencart usualy has: a header, right and left colomn, main page and a footer. so my next question is what are the zones of the zen cart classic page and can you link to a topic where i can found out about them?

i was asking about the search box in the top right of the page- i thought this was the header but it seems is not