the steps to add a background picture in word2013 are as follows:
Step one: Open the word2013 version: Design ribbon--"page background" group (rightmost)--"page color."
Step Two: Open the Drop-down triangle for page color--Select fill effect.
Step three: Click the "Fill Effect" pop-up dialog box-select "Picture".
Step four: Continue to select "Select Pictures"--pop-up dialog--for the first time it defaults to Bing search pictures, click to work Offline, and then appear below--select "Browse".
Step Five: Browse--Add the picture you want to use as the background.
Step Six: Click OK-the desktop background is set.
Step Seven: This setting method tries to use in word2016,word2007 and word2010, according to the principle should all be possible, their toolbar layout is same.