adding adsense code to my page

I am trying to add an adsense account to my site.

pl indicate how it is to be done using a plugin.

the following is the instructions from Google.
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It's as easy as copying and pasting.
1 Copy the code below.
2 Paste it into the HTML of http://www.strategicsalesmanagement.com, right after the <head> tag.
3 Tick the box and click done when you finish.

COPY CODE
check_box_outline_blank
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am not a tech person so cannot work with code
or could I mail you the code privately so you could add it.

thanks