Do I need to show my availability?

Hi @MarieHuggins

A welcome to the forum.

I do not believe you will limit yourself if you do not fill in your available dates, as you are applying for the sits that suit you at the time.

Here is another thread in regard to the availability calendar that could be useful.
You can use the spyglass on the top right hand side to search with some keywords.

You can also add your profile to your forum profile if you need any advice and questions as we have very helpful and knowledgeable forum members, who are always willing to help.