To boot the CD you just turn on your computer with the CD in the drive,
assuming your box will boot from CD. What Tinkster is trying to tell you
is that SuSE probably doesn't run on a Sparc, and you should browse
the files on the CD to determine that. Like, maybe you could find one
named INSTALL or README or just browse to SuSE's website. Of course,
Tinkster used to run SuSE and he probably already knows.