You can set graphical objects for technical analysis and edit them by the "Graphical objects" button under the chart (4th from the left):
Choosing the object (for example, the "Trendline (ray)") you can move it on the chart in the "selected" mode:
To unselect the object you need to click on the "Unselect" button appearing at the top of the price scale.
By clicking on the chart object you will open the dialogue of editing the regime of this object, as well as of all the objects:
By choosing the "Properties" function you can edit the object properties (including its exact location) in the following dialogue of the 2 tabs:
By the "OK" button the graphical object is set on the active chart.