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- Select the layer where the image resides
- Select the Alignment tool (Press the Q key to select this tool)
- Select the item/ image you want to align
- Press the Align center of target button and the Distribute vertical centers of targets button
- The image is should now be exactly center aligned
If you still need help with GIMP, be sure to check out the excellent GIMP 2.8 for Photographers book below.