GT Metrix – Minimize Redirects

Hi. I am pretty new at using WordPress, so I have a feeling this question might be obvious, but here goes.

When I run GT Metrix on the site http://www.thepear.org

I get the following information which is given a RED status:

Remove the following redirect chain if possible:

http://thepear.org/?page_id=154
http://thepear.org/201516-plays/
Remove the following redirect chain if possible:

http://thepear.org/?page_id=206
http://thepear.org/single-show-tickets/
Remove the following redirect chain if possible:

http://thepear.org/?page_id=50
http://thepear.org/get-involved/playwrights/
Remove the following redirect chain if possible:

http://thepear.org/peartestsite/?page_id=53
http://thepear.org/directions/

My question is, how do I find these redirects and fix them?
Any suggestions are very welcome. Thanks.