Changing the text of the add to cart button

When I turn on the add to cart button option the text inside the button says "Choose options" how do I change this text? If i need to change some code can you please be specific in where I can find this code to change? Thanks in advance.

You can change any text in HikaShop by overriding your translation file via the interface in the config under the tab languages:
www.hikashop.com/download/languages.html#modify