How to Replace twm with WindowMaker

[Tito Mari Francis Escaño]

Good day! I have just installed OpenBSD 4.7 complete with the X windowing
system, verified it working with the twm default window manager, and I was
able to install WindowMaker. Based on the documentation from
http://openbsd.org/faq/faq11.html there's a guide on how to try a new window
manager, but what I need is to replace the default twm with WindowMaker. Can
anybody pls give me pointers? I may be googling erroneously, guidance would
be gratefully appreciated. Thanks!