changing css class in title articles main featured

Is it possible to change the appearance of the title H1 to H2 changing css class in the options menu?

What kind css would have to use?how?

If this is not possible in this way, how could it?

You can set style for h1 and h3 in template options. But I cant get what you mean by 'changing css class in the options menu'

I refer to this

...

If im not mistaken (because its not english) that is field where you can set class name to add to menu item. You can enter like 'my_menu_item' (without quotes) then in template_css.css you can use that class name to put css rules like:

.my_menu_item, my_menu_item *{
color:red;
}

Thank you very much, but I would like you to help me a little more please. My programming skills are limited.

I would like to create a customized H1 style, this must be like the H2 template, only for use on the main page of the template. Is it possible to do this with the class name? How does what I can do? What would be the rule in template.css?

Thank you very much.