Post Tiles Italic ? (I love Spun theme)

Do you have a section of the dashboard named, “Custom CSS”, or are you using a Child Theme?

Yes I have installed Jetpack but don’t really know how to use it :/

In Jetpack’s Custom CSS section, enter this;

h1, h2, h3, h4, h5, h6 {
 font-style: normal;
}