Choose the Select tool command 
.
Select an existing coordinate dimension (A).
Position the cursor over the dimension line where you want to insert the jog (B).
Hold the Alt key and click. Two vertices and a segment are added (C).
Drag the handle to reposition the jog (D).
Tip:
You can add jogs to both linear coordinate dimensions and angular coordinate dimensions.
You can also modify the jog by dragging the segments.
You can add jogs to coordinate dimensions while placing them by holding the ALT key.
You can remove all the jogs on an existing coordinate dimension using the Jog button on the Dimension command bar.