Hi Balcee.
Use the following command line configuration to set stack options. You have to be in "config" mode. Type "stack ?" and you will see the options listed below.
Stack related commands
auto-unit-replacement Set auto unit replacement settings
auto-unit-replacement-image Set auto unit image replacement settings
forced-mode Enables the forced stack mode
reboot-on-failure Reboot stack units when their stacking ports fail to come up
replace Replace a stack member that is down
retry-count Configure stack retry count
Enable auto-unit-replacement and auto-unit-replacement-image. If these don't work, manually upgrade the replacement switch, add it to the stack and use the stack replace command.