How to use .lib and .olb in PSPICE

I am using PSpice 9.1 Student Version.

I have downloaded the Philips FET models (.lib and .olb) files from here:
https://www.cadence.com/products/si_pk_bd/downloads/pspice_models/index.aspx

I cannot figure out how to use these files so that ultimately I can use the BS250 MOSFET in my schematic for simulation.

Any help would be appreciated.

Thanks
B

i have no experience with orcad but i have used the libraries in the link you have given.

If your schematic is fairly simple , it may be easier just building up a netlist using a text editor and using a stand alone spice simulation program such as ngspice.
If this method is used all you have to do is
1) find the model that you need in the library file, copy and paste into new text file
2) change any instances of poly (from spice2) to spice3 format in your model.
3) write your netlist in this text file
4) simulate using ngspice

step 2) may be necessary if trying to use libraries in orcad