When you select a text layer by clicking directly on the text or by selecting it's layer in the Design Layers" palette, you will notice the the "Font" palette will open as well.
Please note that you can move the tool palettes around by clicking and holding the dark gray area at the top of the palettes and dragging into position.
There are multiple categories for fonts. Please note that only "regular" fonts can have bold, italics, or underline added. There is a search function for fonts as well. Just start typing and the fonts related to that keyword will automatically show.