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Serif has little strokes at the end of the lines that make up a letter.
Sans serif (Arial) has no such little strokes.

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The Edit Menu

To change the font click on the | Edit | menu. (see illustration to left).
A menu will come down. Click on | Preferences |, and (you guessed it) another menu will appear.

The Preferences Menu

In the left window, under Appearance (see illustration to the left) you will find | Fonts |.
Click on Fonts, and the Fonts menu ( see below) will appear to the right .

The Fonts menu

Click on the arrow beside the box labeled Variable Width Font, and a selection box will drop down.
Use the slider bar, or click on the arrows pointing up and down, until Arial (or any other font you wish to see) is visible in the box window.
Click on the font, and then click on | OK | to close the menu.