I can help you with the navigation as a self-taught web designer. Happy to help.

Any website you go to is going to have a default index page (sitename.com/index.html). A web browser parses the site, looking for the index.html page by default. In the case of this toy store, the big banner at the top of the page serves as an anchor link to the home page, as does the text "Gustoys Shop" directly to the right.
Chrome is my browser of choice. I have the others (IE, Firefox, Opera) installed, but Chrome is what I am most familiar with currently from a plugins standpoint. It comes with a built in translator. If you don't have it installed, I would highly recommend downloading it now. If the browser you use has a translate feature, no need.
You want to go to gustoys.tarad.com. Clicking the large banner ad (the dynamic one with the Gustoys logo, and the little gentlemen), or the text I referred to, will take you there. Accept to translate the page, and the Thai language will repopulate as English. There will be a contact us link in the upper right corner. Translate that page, and you should be able to enter your question in their form, and send it.
Hope that helps!
Bill