The tracking tag can be manually added to your website very easily ... as long as you are comfortable editing HTML pages.
It is important that the tracking code is added on all pages. Many websites have a common header file.
For example, in WordPress there is a header.php you can edit. Howevever, it is much easier (and safer) to use the using the DailyStory WordPress Plugin.
Add the tracking code between the opening and closing
<html> <head> Insert your tracking code here </head>
If you aren't comfortable doing this we would be happy to help.
We are building plugins for other popular content publishing tools and support Google Tag Manager.