How do I get a computer to use one of my available licenses instead of the temporary license that I'm being told will expire tomorrow?

My console says "Payment needed" on one of my computers, and that the computer is currently using a temporary license, which is set to expire tomorrow. However, the line above that says the I have 2 device licenses available for activation. How do I get that computer to use one of my available licenses instead of the temporary license that will expire tomorrow?

Thanks,

RS