content modules title where?

The titles of modules are displayed by your template. It's not possible for us to tell you that as we don't know how it displays them... I'm guessing that it must be in your template's CSS file.

You're talking about module titles in your first message... I'm sure that they are displayed by your template, yes.

Now, for product names, it might be in HikaShop's CSS, but since I'm not sure of what you're talking about I can't answer. Could you give a link, a screenshot of what you're talking about ?

For example, the latest products and featured products modules' title on that page www.demo.hikashop.com/index.php?option=c...ng&Itemid=69&lang=en is displayed by the template.

However, on the page www.demo.hikashop.com/index.php?option=c...ow&Itemid=82&lang=en the related products module's title is displayed by HikaShop.

They are all products listing modules...

Could you give a link of that page so that we can answer you ?

I didn't understand you previous post.

You need to add it. Like that:
h1{
font-size: 1em;
}

Could you give a link of that page ?

You need to add it. Like that:
h1{
font-size: 1em;
}

Directly where ? In the HTML ? In the CSS ?

Yes, you can write it like that.