To edit an object, first click on its stroke path to select it.
button
is inactive (LOCAL mode, see also Global/local edit-point mode),
the selected element is highlighted in green, with
its anchor points transforming into small squares
(except for groups, where the
policy may be altered from group to group, and may be changed by right-clicking
on a group, and selecting the Toggle Highlight Mode action).
has been activated),
the selection is highlighted globally in red.
Eight end-points are displayed, which
allows you to scale the entire selection content.
You can move a particular anchor point by clicking on it and dragging the mouse, or you can translate the whole selection by clicking somewhere on a stroke path. When moving a group of object, the clicked object serves as a reference for alignment on the grid.
If you want precise control over the object location, pressing F2 directly pops up a properties panel that lets you alter the object shape using numerical entries rather than the mouse
Tip : clicking on a selected object with SHIFT pressed let you deselect it.
You can afford multiple selections either by holding the SHIFT key pressed during the select operation or by "wrapping" objects you want to select in a selection rectangle that you create by dragging the mouse from anywhere on the sheet. Translation and scaling operations are then available using the same rules as in the previous paragraph. You can also group selected objects so that they get linked one to each other, by right-clicking and selecting group item in the popup menu; besides, groups are nestables. To ungroup previously grouped objects, click with the right mouse button somewhere on a selected group to raise the popup menu, then select the ungroup operation.
You can add or remove geometrical constraints on the editing operation, by holding some modifiers during the mouse displacement. In addition to the combination of modifiers already used by draw-tools, there is an additional modifier, namely CTRL, which allows you to move the two points controlling the angle start and end in the case they should be at the same position as a point controlling the ellipse shape (by default, these last points have a higher priority and are moved first; hence holding CTRL in effect reverses the priority).
Right-clicking on an object raises a popup menu which lets you apply various operations on that object, eg conversion to other shapes, grouping/ungrouping, etc.
The picture below sketches a typical popup menu for a Bezier curve. This menu gets also displayed in combination with the following objects:

There are another four popup menus, which are shown in the table below along with their associated objects.
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These items have the following meaning (depending on the context and the current selection, some items may be grayed, i.e., inactive):
Graphical attributes, e.g. line thickness, fill colour, etc... can be changed by first selecting objects of interest, then changing fields values in the floating Attribute Editor palette. The set of available attributes is tightly related to PSTrick parameters, since this LaTeX package offers the widest range of possilibites. Refer to the PSTricks documentation for further details.