Changing Connection Credentials to vCenter

I'm new to vOPS server and want to be sure I have some bases covered that I forsee issues with in the future. We change our admin passwords on every server and for ever account every sixty days. Therefore what I put into VMware Connection today will have to be changed during our next passwrord management changes.

What is the process to ensure we don't lose connectivity to cCenter? Is there a way to get to the Connection credentials and change them and should that be done before or after we change the password on vCenter.

Thanks in advance for everyone's help!