While designing in the PosterMyWall editor, you can align various items e.g. images, and text using the alignment options in the right contextual menu. Simply:

• Click on a design to open it up in the editor.
• Select any graphic item in your design i.e. image or text.
• Click the 'Position' tab on the right contextual menu to open up positioning options. 

• Choose any of the following alignment options under ‘Alignment on Design’, according to your requirements: 
  • Choose   if you want to align the selected item to the left edge.
  • Choose   if you want to align the selected item to the right edge. 
  • Choose   if you want to align the selected item to the top edge.
  • Choose   if you want to align the selected item to the bottom edge.
  • Choose  if you want to align the selected item to the vertical center.
  • Choose  if you want to align the selected item to the center of the design.
  • Choose  if you want to align the selected item to the horizontal center.