Some Questions

1.- what is the css adress to change the button choose options?
2.- i´m still in developing and i have some doubts about whats next, in the checkout can i put fields to be filled with for example the text they want to send in a postcard? or do i have to do it before checking out in products options?
3.-How to activate related products? i cant see them under the products.I followed the instruction, created a module in joomal no position set unpublished, save, modify in hikashop module, porducts an related products, save, go to syste configuration and select the module i wanted to be under the product page that returns to joomla module, enable it and save. Nothing happens

Related Product is wonrking now.

The problem continues with the button, because if i use this css sentence it changes the whole buttons of the web page and in others i can change the buttons only where it should be changed, example:
.hikashop_product_quantity_main .hikashop_product_stock .button {
css
}
or
.hikashop_product_quantity_main .hikashop_product_stock td a {
css
}
that ones only changes the buttons where i want to be changed if i use just the one you give it changes the whole input butons. That only happens when i add options to the product and they have to choose and instead of add to cart button appears this one.
Is there any way to add a class to this button to modify only this one an no one more?. Perhaps the solution could be adding one div with I'd and class to refer tu the input button, in tagt case what view should I change and where?

none worked the solution was adding a div wid id and class in the product_listing file so i could refer it to .divclass .button {css }.