Internet sharing from my macbook pro to my iPhone 5

I have changed the MAC address on my macbook pro. This was successful and i continue to use the internet using the internal router also to provide wifi internet to my iPhone. However, since changing the MAC address, i am prompted to put my password in to access the wifi via the macbook pro, it doesn't seem to recognise my password and doest allow the phone to access the internet..... it appears as if since applying the new MAC address, it has given it a new password and i cannot find it..

Any help with this problem would be much appreciated...