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Left (blue) clavicle scaled slightly.

2 In Top viewport, work with the upper and lower portions of the same
arm. Scale and rotate the arm bones as necessary to fit it to the mesh,
taking care to align the biped’s elbow and wrist joints with the same
joints on the mesh.

Posed arm in Top viewport

TIPYou can move quickly between parent and child bones by pressing Page

Up and Page Down on the keyboard.

3 In the Front viewport, rotate the arm if necessary to make it go down the
center of the mesh.

Aligning the Biped to the Model | 911