To set up syncing with Things for iPhone and iPod touch:

Make sure both your computer and your iPhone or iPod touch are connected to the same wireless network.

Launch Things on your iPhone or iPod touch.

On your Mac, choose Things > Preferences… from the main menu and click the iPhone pane.

Select your iPhone or iPod touch from the list and click the Pair… button.

On your iPhone or iPod touch, enter the four digit passcode that is shown on the desktop, then tap Done.

On your Mac, click the Sync Now button.