add to cart button and (+) , (-)

You can use CSS to do that. We customized these in a similar manner on our demo website, so I invite you to look at the CSS we used there with firebug in order to see what CSS has to be used.

I don't see how it could be possible to have custom styling of elements without knowing CSS.
We can't create a CSS tutorial for each button and each element of each layout. At one point, if you want to custom style HikaShop display, you'll have to learn CSS...

On the other end, we understand that there is a demand to easily "adapt" HikaShop to the style of a template. That's why we'll release soon style packs so that users not literate in CSS will be able to do that quite easily without touching CSS.

Here is a tutorial which explains how to use firebug:
www.tutorial9.net/tutorials/web-tutorial...opment-with-firebug/

Here is the CSS we're using on our demo website:
.hikashop_product_quantity_main .hikashop_product_stock .button {
color: #167E93;
font-weight: bold;
background-image: url(../images/add_cart.png);
background-repeat: no-repeat;
background-position: right;
height: 32px;
padding-right: 40px;
background-color: transparent;
cursor: pointer;
}

Here is the CSS for the + and - buttons style:
.hikashop_product_quantity_main .hikashop_product_stock td a {
color: #14CBEC;
font-weight: bold;
background: url(../images/add_white_dot.png) no-repeat center;
padding-left: 15px;
padding-right: 15px;
padding-top: 3px;
padding-bottom: 3px;
margin-top: 3px;
}

Then, you will have to adapt the style to want you want to do...
Here is a website with tutorials on CSS:
www.csstutorial.net/