What do I put when it ask me about my availability

They are wanting to know when you are available to work. What times or shifts work best for you schedule. It doesn't mean they will give that to you, but they need to know when you are able to work.

Yes, tell them the truth, if it is asking for what days, shifts, hours, tell them when you are available.

If looking to know when you can report to work, if now, two week, tell them the truth