If you have a Named license, follow these steps. The steps are the same for connecting to an online floating license pool.
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During the default installation, the license application is installed locally on your machine. For more information on the specifics of the installation, go to the Installationpage.
Once you start a render with V-Ray, you are prompted to verify your license by signing in.
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Alternatively,
Open Maya and go
to
to V-Ray menu > Licensing > Chaos Account.
Select Sign in from this dialog and enter your Chaos account credentials on the Chaos accounts Sign in webpage.
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If you don't sign in first, and attempt to render with V-Ray, you are prompted to verify your license by signing in.