Even though the Owner has not responded to you, you can go back into the message area and write another message to the Owner. The response times vary so much. Frustrating! You would think that they would want to get this done asap, but people are busy and tend to procrastinate! You never know.
When we first started, I would apply to Sits and excitedly wait for a reply. Well, often times, the replies never came. It was disheartening. Just move along and apply to other Sits!