connect you external usb to the harbour - this is done in the Menubar. It will remember your ssid/user/pw.
then in OP-network set your internal pi wlan to make your AP. later on the right side set it to share "auto" or your external USB.
but here maybe some issures - here in europe you can use only 1 6 11 Channels for the 2.4GHz wifi because overlapping channels. And if your harbour uses channel 11, don't set your own AP also to 11 - instead use another 1 or 6 - whatever is free or lesser used. So you wont interfere with your own Frequencies.
good luck
holger
then in OP-network set your internal pi wlan to make your AP. later on the right side set it to share "auto" or your external USB.
but here maybe some issures - here in europe you can use only 1 6 11 Channels for the 2.4GHz wifi because overlapping channels. And if your harbour uses channel 11, don't set your own AP also to 11 - instead use another 1 or 6 - whatever is free or lesser used. So you wont interfere with your own Frequencies.
good luck
holger