When creating a custom token you don't enter your own eth address in the address field. Use the contract address. Try this:
0x983f6d60db79ea8ca4eb9968c6aff8cfa04b3c63
Thanks a lot - my SMN tokens are showing up in the wallet now

Anyway - where did you find the smart contract address? I couldn't find it myself.
you click on somn token in ethplorer and a the contract address will wppear in a box on the left side of your screen