How to change the font size in the app Phonto for iPhone?

I just got this app on my iPhone called "Phonto" and it's working great but I can't figure out how to change the size of the font. Can someone please help!

*By the way, the only reason that this is under a weird category but I don't know what else categorize it as:$

You can't

WILD GUESS:

Click on the red SIZE Button?

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