There are many ways you can do that, Perl Tk has different geometry (ex. pack, grid, place...) managers. To get a better control while positioning widgets you can:

• specify options for the Geometry manager to make the widget placed to a certain position.
• you can also place the widgets to be aligned in frame widgets and then pack the frame widgets, this has superior control, like when you want to create menu options bars.

#here are some of the options you can specify to pack.
#learn about the different arguments they take..
#general explanatory non-functional code...


$emailLab=$mw->label->pack(-anchor=>'',-ipadx=>'',
                           -ipady=>'',-expand=>'', -fill=>'', 
                            -padx=>'', -pady=>'' );
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#using frame widgets, general explanatory non-functional code


use Tk;
$main=MainWindow->new;
$frame=$main->Frame;
$frame->pack(pack options) or $frame->place(options);
$frame->Label()->pack();
MainLoop;
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I would strongly advice you to do the following:

1. check the Tk documentation through "perldoc Tk"
2. run the Tk command "widget" from your console to see more examples.
3. Check Geometry Management