Hi: Dear DP members: I had an account with google analytics,i had cut the code and put them at my WP theme : footer files,if that's enough ? Do i need add analytic plugin for my wordpress blog ? Please we can discuss this here. Regards.
There are plenty of plugins available for the job. This is one example- http://wordpress.org/extend/plugins/google-analytics-for-wordpress/
Just install the plugin and in the options (settings in 2.5) page insert the code accordingly for your analytics... simple stuff really.
I didn't use a plugin when I installed google analytics on my blog, but I ended up placing the code in a few different places before I was satisfied it was workng correctly. I have mine placed in my sidebar and I compare it to the results statcounter gives me. Analytics isn't real time though, so give it a day or two before fiddling about too much.