The problem is that you are using a bad wallet, which doesn't let you configure the fees. You can click Customize as NotATether suggested and set a low fee such as 10-20 sat/byte, which will be cheap but will take some days to get confirmed.

If you send to just one address it will be cheaper. The more addresses you want to send to, more expansive the transaction will be.

You can read about it here
https://bitcointalk.org/index.php?topic=2848987.0