Hi,
It's not possible to add to a cart a product if there is some options to select.
If you want to have a "add to cart" button, you have to remove the options and create several products for the different options.
After that, you can change the translation of "choose option" to "add to cart" but when the customer will click on it, he will be redirected to the product page in order to choose the options.
www.hikashop.com/en/download/languages.html#modify
Best regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.