Use one of the selection tools: Box Select 
, Freehand Select 
, Freehand Point Select 
, Ellipse Select 
, or Magic Wand Select 
to select part of the picture as a block.
After selection, delete, cut, copy, resize, rotate or mirror the selection. Crop the picture so that only the selected area remains. Apply effects to enhance or adjust only the selected area.
For more information on selecting, modifying copying and cutting, see Select, Modify & Copy.
When part of the picture has been selected with one of the selection tools, click and drag one of the corner resize handles to change the size of the area. When the pointer is over a resize handle the pointer changes to a double-headed arrow pointer 
.
Hold the Shift key down when resizing to keep the proportions the same. Hold the Ctrl key down to resize from the center. With selection tools other than Box Select, only the area that was selected is resized, even though the selection box appears rectangular.
If no part of the picture is selected, use the Scale Image
function to change the size of the whole picture. See Scale Image .
Rotate part of the picture using the Rotate Handle on the selection box.
To rotate part or all of the picture by exactly 90 degrees, use Rotate 45 
.
Rotate Part of a Picture
-
Select part of the picture using one of the selection tools.
-
Click and drag the round rotate handle on the selection box to Rotate the area to any degree.
When an area is chosen with one of the selection tools, only the area that was selected is rotated, even if the selection box appears rectangular.