First click “Townhall” button as below.(Townhalls of different races have different appearances.)

 

 Click it and enter the building contruction interface as below.

 

If the requirements are met, the “Construction” button to the right of the embassy will become bright. The requirement to build an embassy is that your town hall should reach lv2.

Now we try to upgrade the townhall. Click “Enter Townhall” and you will enter the interface below and click “Upgrade” to upgrade your townhall.

 

 

You can build “Embassy” after the upgrade. After the construction completes, click

 

 “Guild” on the picture to enter detailed guild interface.