We have an article in our documentation about activating a license:
However, you should keep in mind a license file is only associated to one Sitefinity instance - or else said - one domain. In case you're running the project on a different domain you will inevitably get trial messages, because the license is not associated to this domain. What most our customer do is to run their staging and development projects on a subdomain, because Sitefinity is licensed for one domain only, but doesn't have a limit for the subdomains, that may be using it. A really important thing to keep in mind is to have a mapping in the host file of the server from the IP of the server to the domain:
Example: 220.127.116.11 ( or 127.0.0.1 ) test.com
And in the bindings for the site in IIS to enter the domain name again as host header - test.com.
If you continue to have problems, please let us know.
the Telerik team
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