Follow the steps below to apply bold, italic, underline & strike (i.e. Font styling).
1. Click on the text frame and highlight the text within that frame that you'd like to style.
Notice: Font styling can be added to individual characters within a single text frame. That means you can have a single word with multiple styling in it.
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. From here you can simply select any style you'd like to apply. Once selected, you can click again to remove it.
Notice: Bold & Italic are not always present with every font type, but underline & strike are always available. This is due to the creator of the font not producing the bold & italic versions.