The most import setting in LMT is the "Server Name" and "Site Activation Key". These fields can be found after opening LMT, select Tools> Options> the following dialog will then appear:
Use one or more of the following options to get this information
For Hosted licenses, Server Name = selectserver.bentley.com
For Deployed server, contact your IT department or Bentley On Site Admin
How to Request an updated license for a Deployed Select Server
The primary location for this information is your company's designated "Bentley On site Admin(s)". This person(s) would have received an email from Bentley containing this information.
ONLY If you are an Bentley On Site Admin, use the procedure here.
Contact Bentley Licensing group by phone or by submitting a Service Request directed to the Licencing group.
Due to security issues, ONLY person(s) listed as an Bentley Onsite Admin can request the Site Activation key be sent to them by email. All others will be provided a list of Bentley Site Admins with which they can contact directly for that information.
Interactive Guide to Licensing