Continuing a print is complicated unfortunately but if it's a long (more than 5 hours say) print then it's worth learning how to continue a print. Each time you do it you get better and faster at it (like baking cookies).
First you need to use pronterface to find the exact layer to continue on. Pronterface is here:
http://koti.kapsi.fi/~kliment/printrun/
read all gr5 posts here:
http://umforum.ultimaker.com/index.php?/topic/4213-ideas-for-recovering-failed-prints/?p=34788
post #9 here has specific code change example for um2 (ultigcode):
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gr5 2,224
Yes. First step - keep the bed warm. Once it cools then it pops off and you have to start over.
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