Create an authentic texture effect using the Grain filter
Duplicate the Background layer in Elements by pressing Cmd/Ctrl+J or by going to Layer> Duplicate Layer. The latter enables you to enter a name for the new layer to help you identify it, such as ‘Photo Grain’.
Head to the Filter menu at the top of the interface and then to filter>Grain. Change Grain type to Stippled and set the Intensity to 44 and Contrast to 52. Use the preview in this menu to assess the grain but the image should now be monochrome. Hit OK to apply these settings to your image.
Head to the Layers palette and lower the Opacity of the duplicate to 50%. The strength of the grain effect should look less imposing. The lower the Opacity slider is, the more the colour will show through.