1) On the "Spectrum Name" tab, define the name, axis types, and axis interpolations.
2) You should now be able to directly enter the pulse data points. Do this, don't use the DLF generator - that isn't what you want.
3) Define the Force Set(s)
4) Define the Load Case
5) Setup the Combination Case if you need it.
6) Address the Control Parameters
7) Run