when in the client, look to the top left where it shows your address.. does it still show "primary" below the address? if so click that address and a drop down should appear with a new address that does not say "primary". that should be the account you have nem in.
nope- it says 'primary' but when I click on that, the same appears below that: same account number with 'primary' in blue again ...
did you create a wallet with a password that was your private key? Or did you do the [Add Existing Account] from the drop-down cog located next to your Account Address and enter your private key in there? The latter should have opened up another account which you would then do what you quoted.