Drag from a ruler to add a guide, or press Enter to add one at the center of the view. Drag a guide to move it; drop outside the canvas view to remove it. Escape cancels a drag. Focus a guide and use arrow keys to move it by one pixel, or Shift and arrow keys for ten. Delete or Backspace removes the focused guide. Guides are temporary and are not exported.
Drag the frame to move; drag handles to resize. Hold Shift to lock the axis or aspect ratio. Command/Control-click Layers to select multiple.