Can't format image element "text over image" - Upfront

I am trying to place an image on a page using upfront and trying to set text over the image with paragraph and H2 sized font. I was unable to assign an htag to the text on my site. I tried to do the same on the upfront demo site and couldn't do it there either.

I have attached a photoshop sample of what I want to obtain using the upfront image with text over. I have also attached a screenshot of the demo site not able to change or mix paragraph text and H tags. I can't change it from default at all.

Thanks