Using a tool such as Developer Tools in Chrome or httpfox for Firefox load the page and look for the utag.js to load. If you have tags set up in your profile you can then look for utag.x.js where x is the UID for that tag. You can find the UID number by logging into Tealium and clicking on the Tags tab. The UID number is located on the right side of that window.
Once you have verified that the utag.js and all of the utag.x.js' are loading then verify that you see the request being sent to the appropriate 3rd party vendor.
Hope that helps!
Another basic validation you can do is to launch the Tealium WebCompanion bookmarklet. This will verify that the correct version of utag.js has been detected and show you which tags were loaded. The WebCompanion can be found by clicking your email address at the top-right of Tealium iQ, then dragging the bookmark to your browser's toolbar. Simply click that bookmark after loading a page from your website to validate that utag.js has been loaded.
Remember to "Accept as Solution" when your question has been answered and to give kudos to helpful replies.