Unresolved Z axis not set right

Ok recently my printer started clogging with every print. It eats a notch in the filament and stops coming out. Turns out that its due to the nozzle being on the bed. it starts out to low and the bed plugs the nozzle so that it always clogs. How do I re zero it to were the nozzle is the right height when the print starts back out. keep in mind I am using the latest matter control software. Any help would be greatly appreciated.

 

Change your z offset, no longer use MC, but either someone will chime in or Google is your pal.
Negative numbers bring it closer to the bed, so you want to use positive .1 increments.

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http://community.robo3d.com/index.php?threads/read-me-my-robo-doesnt-auto-level-correctly-faq.4664/
Read through this. Hopefully you will find something that will help you.