change headline font?

Try adding this to your custom CSS

.entry-title {
	font-family: "Arimo", "arial", "sans-serif";
}

Thanks, abhik21!!!

Now, how do I get the H1/main titles to be centered? ??

Try this

.entry-title {
	font-family: "Arimo", "arial", "sans-serif";
        text-align: center;
}

How about changing the font size? (I’m working on https://test1.fxmassociates.com/).

@uppercapek9s, Please open a new thread https://www.ads-software.com/support/theme/twentysixteen#postform