The previous chapter covers text that affects playback tempo, but there are many other types of text available in MuseScore: lyrics, chord names, dynamic markings, fingering, headings, plus many more. These are all accessible from the main menu via Create → Text.

For short generic text use staff or system text. The difference between these two texts is whether you want it to apply to a single staff or apply to the whole system. This makes a difference when extracting parts.