“Finishing off” is simply the process of breaking the yarn from the remaining skein at the end of a work.  It is done as follows:
Next you will want to weave in any tails of yarn that may still be hanging off the work.  There are two ways in which to do this:

With a Yarn Needle
With a Crochet Hook
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Once the last stitch is completed, cut the yarn so that there is
a 2-3 inch tail hanging from the work.
 Yarn-over, and pull this tail completely through the last loop
on the crochet hook.
   
 
Pull the tail to tighten the knot.  Finishing is complete.
  
Thread the tail of the yarn into the yarn needle.
 Thread the needle down the side of the work.
   
 
Pull the tail through.  Weaving is complete.
  
Thread the crochet hook through the last few stitches of the
last row.  Yarn-over the yarn from the tail.
 Pull the tail through the stitches.  Weaving is complete.