You don’t want to change the style tags, you want to add the styling inside of those tags. You might want to restart the step to get the original HTML back.
Once you have the style tags back as they should be, you should use the format shown in the instructions to style the h1 element.
element {
property: value;
}
Where element is replaced with the name of the element you want to style, property is replaced with the name of the property you want to style and value is replaced with the value you want the property to have.