Please help this noobie  ;-}
I just loaded and started the Makers version of SolidWorks 3DExperience today, and I was working fine creating my first sketch, when suddenly I can no longer select or delete anything in the sketch.  I can continue to add elements to the sketch, but once each element is complete, I cannot select it, nor delete it.
Did I accidently convert the entire sketch into a block, or into some new uneditable entity? 
Please give as many moron-proof instructions/suggestions as possible.
A thousand thank yous in advance,
-SamIam_HuRU