You have all the instructions that exist: use a plain text editor (notepad.exe is fine) to edit files instead of using a text processor. The screenshot you attached show that you did a "show source" when browsing the config panel of your gallery: that's utter nonsense and not what you are supposed to do. Download the file that corresponds to
http://kuulkreations.com/gallery/themes/rainy_day/template.html using your FTP app to your client, then edit that file with a plain text editor, inserting your google analytics code into a new line of it's own before
</body>. After you did, save your changes and re-upload the edited file (again: using your FTP app) to your server, overwriting the existing copy on your server.
You seem to lack absolutely basic skills. We can't teach you the basics here, you should really consider not to run a website of your own if you're not ready to learn the core skills first (before running such a site). You almost certainly won't be able to interpret the stats generated by Google analytics, so don't be too disappointed. Google analytics won't brew coffee for you, nor will it tie your laces. It will just display visitor stats. You need to have some experience in web design (which you appear to lack) to make use of that tool. The fact that you asked Google for support on their free tool shows that as well (I had a good laugh though).
I'm sorry, but you're not the target audience of Google analytics, nor are you among our target audience, as we require users to have basic web skills as far as editing basic HTML is concerned.
You will probably reply that I was a rude fellow and that you want to complain and that this is in no way what you expect from customer support, but then think again: you're not our customer, as you're not paying anything, nor are you paying anything to Google. If you need to be spoon-fed in web design and you don't have the skills to accomplish the basics, then make your homework first, i.e. do the needed reading and experimenting first, because that's what we all had to do first when we learned the trade. I'm not rude in telling you the obvious. It's you who is rude, because you want results fast without playing by the rules, i.e. learning the ropes first. If you want fast results and you're not ready to learn first, then hire someone to do the job for you: there are millions of fourteen-year-old boys next door who are eager to earn some pennies and do that job for you.
Please accept this statement as it is. I'm not posting this to hurt you, I'm just stating the obvious.
Joachim