Well, with the library you have, only the device having the address 0x68 is active during I2C operations, so you simply arrange for the other devices to have the alternate address by tying their AD0 pins to an output pin.
Well, with the library you have, only the device having the address 0x68 is active during I2C operations, so you simply arrange for the other devices to have the alternate address by tying their AD0 pins to an output pin.