Hi Juliemac2 ,
The example is in the user guide. Please find it here > URL parameters reference.
A sample is given as below:
http://PIVision.domain.com/Displays/15914/BoilerFanInformation?Asset=\\AFServer1\DB1\CrackingProcess\Equipment\Boiler309& starttime=2017-10-25T12:50:49.755Z& endtime=2017-10-25T13:50:49.755Z