[racket] Basic inquiry

I am sure that this will sound stupid, but I am a complete beginner to
programming and have just downloaded Racket from the
racket-lang.org/download/ site.  It is now installed on my computer but
when I click it, the only thing that opens is a black screen with a
flashing cursor below the sentence "Welcome to Racket v5.2.1".

Where do I go from here?  How do I choose the Dr Racket programming
environment and the level of beginner as advised in the book "how to design
programs."

Desperate for help.

Thank you.

Saad Bashir
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