COSTUMIZE STANDART BUTTONS ex. BUY NOW or REVIEWS or SEARCH...

Hi,

I need to know how to costumize or apply my costumize buttons of BUY NOW... REVIEWS... and SEARCH...
I made severeal personalized buttons, including these ones... but some buttons are working OK... and some other buttons are not showing up...

I understand that this is a feature of my costumized template... some buttons if i change the image i can change the button, but some other buttons with or without image just appear with simple TEXT wroted and formated by code or something else... you can check the BUY NOW button or REVIEWS button that i wantto chage... and you can see WRITE A REVIEW button already
costumized and ok (https://www.etapavirtual.com)

Somone can tell me please, how can i use my costumied buttons in those which i cannot change the image, like BUY NOW or REVIEW?

Thanks a lot,

Etapa Virtual