Texas Do Not Resuscitate Form In Texas, How Do You Change Your Liscense Plate Number On Your Registration?

In Texas, how do you change your liscense plate number on your registration? - texas do not resuscitate form

I live in Texas. I personally ordered plates TxDOT new line. I was curious to see how the record for me, because I checked my car and could not the new number, because the first match in the system. So my new plates come, but my old liscense plate number is on my label? Is this a problem? Does it matter? Is it possible to change?