Upload Google analytics&adsense

Hello,

I have a multi-site http://www.whyflowers.co.uk
1.I want to know how do I add Google
analytics's to my site?
I try your guide but I didn't success.
2.I want to add Google adsnse to
my site.
Can you tell me please to size of the
image in the attach file?

Thank you,
Tzach,
Menashe