After logging into site.
1) Go to the top left and click Visit Site.

2) Go to the page you want to edit by navigating to the page like a web site visitor. In this example it is the Accommodations page. Click the Edit Page link at the top of page.

3) Once inside the page click the + sign on the right.

4) Put your Thai translation in the boxes on the right column. Do not edit the English translation boxes.