To select a font for your presentation, go to the Design Tab.
Look for the Font button located on the right. You'll find here the selection of fonts available.
Select the font you'd like to use. Once you click on it, a little menu window will pop-up asking you whether you'd like this font to be applied to the Headings, the Text (paragraphs, charts, captions, bullets) or all the text of your presentation.
To add your own font, click on the +New button.
Upload your font file and name your new font...
(Slidebean supports .ttf or .otf files)