Introduction
This is a Numerical Integration step that can be used in SignalExpress. It is simply a Time Domain Math step, but can be customized to perform other functionality. For more information on custom steps in SignalExpress, refer to:
LabVIEW SignalExpress 2009 Help: Building Run LabVIEW VI Steps from Existing VIs
LabVIEW SignalExpress 2009 Help: Building Run LabVIEW VI Steps from a Template

Steps to Complete
1. Download the .llb file and save to disk.
2. In SignalExpress, add a Run LabVIEW 2009 (32-bit) VI step.
3. Configure the VI with the signal you'd like to integrate.

Additional Notes
This step is configured for LabVIEW 2009. Refer to the help files above for creating your own custom SignalExpress steps. This requires that the LabVIEW Development System be installed.