What kind of license do you have?
I am assuming a software license.
I don't have a software license so I don't know the exact procedure.
But I do know you have to release the license from the machine it is currently running on, and send it back to the company 'pool'.
You can then 'claim' that license on the machine you next want to use.
When finished with it, you have to send it back to the company pool so it can be claimed on another machine again.
I am guessing (as Ling suggested) that you do this through the License Manager program, where you have to sign in with your Graphisoft ID to manage software licenses.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10