If you want to save your newly changed Performance Edit settings so that they become the default setting, (therefore the BK-7m will power on with these new settings every time) follow this procedure after you've edited the performance edit parameters and before powering off*:
1) Press the Menu button
2) Scroll to "Performance edit" and push the cursor to enter the parameter
3) Scroll to "Save as Default" and push the cursor to enter the parameter
4) Rotate the cursor dial to select "Yes", and then press the dial to confirm all of your new settings.
*This procedure will apply to any setting you've changed in the performance edit. So you can make multiple changes, and save them all at one time with this saving procedure.