My brother on my family tree was married and I am trying to put in her information. However, it says his spouse is deceased and will not let me replace that with her information. She is still living .
Here is the instruction from the Help Center at Family Search.
This is a little complicated but helpful.
To change someone from Deceased to Living, you have to send a request to Family Search support. Do this through the Contact Us link under the Help icon (the question mark). They will want some type of simple explanation.