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How do you tell when a blonde has used a computer?

There is writing over the white out on the screen.

I don't understand what these line mean.

What are they talking about?
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'Blonde' jokes make fun of stupid people (for which blonde women have unfortunately been unfairly chosen as the representative).

This joke presumes that someone could be so laughably stupid as to use [url=http://www.wite-out.com /]'WHITE-OUT'[/url] to cover an error in the print on the computer screen-- and then even more laughably stupid as to write the correction upon it!
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Comments  
Laughable. Emotion: big smile
Thanks, Mr M.