Disappointed, cancer gone too far. How do I get on a trial?

Hi im new to this chat, my name is kat! I was recommended to join a chat as told very helpful! 

I was diagnosed with bowel cancer and an emergency operation later i came out with a stoma.  Sadly the cancer spread to my peritonium,  chemo has helped to push the cancer back, eniugh, we were told before Christmas., for an operation to give me longer to live. 

Today sadly ive been left feeling v sad to find out the cancer gone too far and too complicated to do so its back to chemo for me.

Does anyone know how to get info on trials for certain cancers?