firstly.. to remove config lines you'd type the word 'no' in front eg..
#no ip nat inside source static tcp 192.168.1.169 3389 interface Dialer0 3392
and that will delete that line only..
the two extra NAT's you've entered are correct, and should work fine..it dosent look like you've got any other access lists off Dialer0, but you 'may' have some on your Ethernet ports.. if you do post them up so we can make sure they're not blocking the RDP ports.. also make sure you're entering the port #'s correctly in the RDP client..
also.. for future reference, you have posted type 7 cisco passwords.. you might want to get these changed now, as these are 'easily' decryptable, and anyone with an internode DSL account will now be able to use them..