How do I resize my screen in Pixlr?

I was introduced to Pixlr over the weekend. It’s going to become a staple in my life. However, the fonts and display are sooo tiny tiny. They’re about a font size 5.
With all other pages I can hold “control,” and roll the dial in the middle of the mouse to make the pages larger. However, that doesn’t work in Pixlr.
There is a “settings” tap on the top right, but when I click on it nothing happens.

Any ideas, guys?