Actually very simple . First is important to rotate the Arms to a T Pose
then select a Bone on the Guide (right) and the the opposite Bone on your Character
If your not sure wich Bone to select. you can also read and select the Bones in the Scenemanager. (left)
eg. Head > Head . RightFoot > Foot_R , Hip > Pelvis , Left Shoulder> Clavicle_L ect...
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liebe Grüße vidi