How to install the billboard on the lamppost?

A board is fixed in the middle of the upper and lower flagpoles, so that the upper and lower flagpoles and the board fixed in the middle form a billboard, and the billboard is provided with a fixture for connecting the lampposts. The fixture is welded on the board and has a ring structure with clamping screws at the end. The billboard composed of flagpoles at the upper and lower ends and plates fixed in the middle is divided into left and right pages, and two groups of fixing devices are arranged on the flagpoles at the upper and lower ends.