why don't my 2003 nissan murano move after i changed transmission fluid

Hello, my biggest concern would be: did you use the correct transmission fluid? If you have a Continuously Variable Transmission (CVT), it requires specific fluid, or you will not have engagement. It's a big deal. Also, you removed the transmission pan? Did you dislodge anything when you were inside there? Obviously, something is related to the action of having "changed the transmission fluid".