The Horizontal Distance option allows the user to create horizontal dimensions between any two points. Select the Horizontal option, click the first point with the crosshair / cursor (diagram #1), then select the next point (# 2). Drag to the text box to a convenient location (# 3) and click to place (# 4).
The Vertical Distance option allows the user to create a vertical dimension between two points. It functions in the same way as the Horizontal option, but in the vertical.
Click Round patterns in succession
then click to place dimension
The Distance option allows the user to measure the distance between any two points (or patterns). Click each point in succession, drag the text box to the desired location and click to place.