Follow the steps below to change the font in your text box.
1. Click on the text frame and highlight the text within that frame that you'd like to change the font of.
Notice: Fonts can be added to individual characters within a single text frame. That means you can have a single word with multiple font types.
2. Click on the font icon button if it's not already open (It's the default tool view for text tools, so it's likely to already be open and this action is unnecessary).
3. Click on the font dropdown.
4. Select the new font name (you'll notice the current one is marked with a check)