To create a selection Focus Photoeditor gives you a variety of tools that can also been used in conjunction.
The Selection Panel:
Let's first take a look to the selections panel in the top toolbar of the program:
From Left to Right the commands present on this panel are:
- Disable/Enable Selection: use this command to temporarily deactivate a selection. The current selection, will not be lost after that. Click it again to reactivate the selection.
- Invert Selection: use this to select the complementary region of the selection, that is actually all pixels that were selected will become unselected and viceversa.
- Undo Selection: if you have made many selections, you can pick a previous one by clicking this undo button.
- Redo Selection: It will pick the next selection in the undo list.
- Select Mode combo box: you can choose if the newly created selections should replace, be added to or be subtracted from the existing one.
Other commands about selections are present in the Selection menu.
Tools to Create Selections:
Create Selection tools: 
-Select by color
This selects area of similar color in all the picture, using a tolerance.
-Select by Magic Wand
This selects area of similar color locally, using a tolerance.
-Select by painting
You can paint a selection with this tool.
-Select by Lasso
You can create an irregular region-selection, by defining with a pen its border.
or using geometric selection tools like:
-Rectangular, Elliptic, Linear or Pencil selections
