Thanks. I had no idea what the oval was for. I must have pressed it unknowingly when I first ran Safari.
Now I can see the icons. From here, it was a simple matter to set my default browser.
As you can see, I'm a former Windows/Linux user who has yet to master every detail of the Mac world In fact, I just got my Mac on Thursday.
I was afraid there was a flaw in the installation.
Thankfully, as with the rest of OS X, the system is pretty much flawless.