What kind of novena are you doing? There are many different ways to do it. Basically, a novena is any prayer you say over nine hours, or nine days, or nine weeks. There is also a populare 30-day Eucahrist novena. Many prayers used for novenas have a place in the middle to state your intention. The most important thing to remember is that God knows what your heart’s desires are… so even if you can’t perfectly articulate them, you are getting your intentions across.
I hope this helps!