If your print head needs to be manually moved, you can do so by accessing the Spooler to use the movement buttons.
With printer on and connected, click the gear in the upper right hand corner to access settings
Navigate to the advanced settings tab and click the checkbox labeled "Expert Mode" to open the Spooler
Locate the movement arrow buttons at the left of the window and use them to move the print head in the direction needed
You can adjust the values to move the print head further in either direction
Warning: the print head can be moved "outside" its bounds. So be careful when moving the print head down towards the bed as you can drive the print head into it.