To display your System ID (lmhostid), download and run the Foundry System ID (FSID) utility
To install a licence key, download and run the Foundry Licence Installer (FLI)
To manage floating licences across a network, download the Foundry FLEXlm Tools (FFT) utilities.
If you can't get your licences to work, download and run the Foundry Licence Diagnostics (FLD) utility, then email the text file to support@thefoundry.co.uk.
The Foundry FLEXlm Tools User Guide tells you everything you need to know about licensing Foundry products with FLEXlm.