How do I move a Guideline that I have already placed.

Issue Description

You misplaced a Guideline, how do you move it into place?

Solution

Select the arrow tool and hover over the Gridline till an orange ball appears.

Left hand click the ball and drag it to the correct position. 

With the left hand click still active you can select the TAB key to open up the tracker so you can input a set value to move the Gridline by.