You can directly edit rigid skin point set membership with the Edit Membership Tool. For a more intuitive approach, you can also paint rigid skin point set memberships with the Paint Set Membership Tool (see Paint rigid skin point set membership).

To edit set membership with the Edit Membership Tool

1. Switch to object selection mode.
2. Select the joint whose set you want to edit.
3. Go into component selection mode (click the select by component type icon).
4. Select Edit Deformers > Edit Membership Tool.
5. Using the pointer, select the points whose rigid skin point set membership you want to change.
6. To add points to the currently selected set, -click the points you want to add.
7. To remove points from the currently selected set, -click the points.
8. To add points to some other rigid skin point set, first select the rigid skin point set’s joint. The points currently in the set are displayed in yellow. Now, as before, select the points you want to add by -clicking them.