$ go get 'github.com/lightstep/lightstep-tracer-go'

import (
    "github.com/opentracing/opentracing-go"
    "github.com/lightstep/lightstep-tracer-go"
)

func main() {
    // Initialize the LightStep Tracer; see lightstep.Options for tuning, etc.
    lightstepTracer := lightstep.NewTracer(lightstep.Options{
        AccessToken: "YourAccessToken",
    })

    // Optionally set the opentracing global Tracer to the above
    opentracing.SetGlobalTracer(lightstepTracer)

    ...
}