Linking Adwords Analytics

How do I link different campaigns Google Adwords Google different pages of analysis?
Under a primary Google account I set up websites with Google Analytics. Today, I just created an AdWords account and I created two campaigns of each for a different site of the two sites of analysis introduced. How can I link the specific campaigns of specific analysis. I tried and it does not let me select one of the sites of analysis. And now, I do not even know how to get back in to the old Analytics see statistics for the other site. He keeps the opening of Google Analytics in AdWords now. And he seems to have deleted all my results previous follow-up for the site I tried to forge links with AdWords! wtf? Wait it didn't delete the details. But I still can not seem to access other sites that I had put in place anaylitics. The drop down menu to select different accounts has only one I listed related. I can not access the others I like I did.
You may not be able to do, how you think. Work Easy is about creating a new profile for each site and apply a filter to include Canada Post. Filters and expressions can work much magic in GA
Linking AdWords and Analytics.mp4
