I developed a new page about the history of organization (called GEC) on google sites and I am able to see that page (GEC History) through sitemap as shown below:

However, I am not able to see that similar page on main tabs which are always present at right hand side on the website to browse across the website as shown below:

I am new to the google sites so I am not sure where exactly am I going wrong in making a new page and showing it on main tabs. The way I developed the new page (GEC History) was to click on New page (c) while being on Home, and once it directed me to name the new page then choosing the option as shown below:

Can someone help me to display the name of the new page (GEC History) on the tabs shown in figure above? Thanks.