I just send a pic from my hp to e iMac via bluetooth, desktop background?

I just send a pic from my hp to e iMac via bluetooth, desktop background?

Congratulations. Two things, oje why did you use bluetooth if you have an internet connection and router? You could have sent it faster over the network. Two, did you want to ask a question?

How to choose a desktop picture in Mac OS 10.9…
- Open System Preferences > Desktop & Screen Saver.
- Select the "Desktop" tab.
- Click the + sign, lower left, and navigate to the folder that has the picture.
- Click the drop list for pattern options, and choose "Fill Screen"

NOTE: Tiny pictures will not make a good desktop picture, unless your screen is the size of an iPhone.