google analytics in a multi site instalation

hi there guys..

I´ve installed GA+ in my multi site installation and I want it to be able to show statistics for my main site and the subsites as well.

here are my doubts:

1. Documentation says "If you are using a subdomain install and want to also track their activity you’ll want to also check the radio button next to ‘Subdomain tracking‘" but couldn´t find the that option

2. the documentation also says "Network Activation of Google Analytics provides each site with the ability to use their own Analytics account". The plug in its already network enabled but when I go to a specific site dashboard
there is no Google analytics option!

thanks