By default, the multi-chain IK solver is not available.

To create the ikMCsolver node for your IK handle

1. In the Script Editor or Command Line, type the following MEL command:

   	createNode ikMCsolver;
   

2. Press Enter on the number pad.

   A new ikMCsolvern node appears in the dependency graph.

This solver is now available from the Joint Tool, the IK Handle Tool, and the Attribute Editor for any IK handle.