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how to make use of the flexible under the solve as

Question asked by Tesfaye Wakessa Gussu on Apr 4, 2013
Latest reply on Apr 7, 2013 by Jared Conway

as i have tried to show in the image file i attached ,the both rigid and flexible icon under the solve as are in active.i was unable to change from regid to flexible.can i get anyone help me solve this problem?