in reply to Problem understanding how to use modules

I think you mean 
use lib "/users/<myusername>/perl/Tk-DKW-0.03/blib/lib";

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The use Tk::Menustrip; looks for Tk/Menustrip.pm in the directories listed in @INC, not Menustrip.pm. See require, whose mechanism underlies use.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In Section Seekers of Perl Wisdom