e-Clubhouse Editing Toolbar - Horizontal Line Tool

Place your mouse cursor on the webpage where you would like a Horizontal Line shown.  This should be a position between paragraphs. Click on the Horizontal Line button, and the line will appear as follows: 

This tool does not provide you with other attributes for a Horizontal Line.  To modify the length, width, color or position of the line, you will have to investigate how to make those settings by using the Source button, and typing in the appropriate HTML code.