Here you can adjust the joint parameters for a new model. The mesh can be viewed from front or side, and body parts chosen by clicking on the mesh or in the list at the top right. The twist can be changed by drag-dropping or entering numbers in the text boxes. Numbers can be copy/pasted between boxes. Each parameter can be reset to original with the Revert buttons. If you click the Save button, all parameters will be saved to RAM, and when you click Revert after this the value will return to the saved value, allowing incremental saves. When you are all done, click Save to Disk.