Relaunch the Sia-UI (it will bind to your manually started siad instance)
This results in:
A critical error loading Sia has occured: Siad unexpectedly exited. Error log: Loading...
(0/7) Loading siad...
listen tcp 127.0.0.1:9980: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.
Just for fun I created a Sia account and started mining.
You needed an address for mining first. Where did you get that one?
The only way you can get your address is by running the Sia wallet.
If you got that address for mining from your wallet by clicking the receive "button", you can use that same address for every possible incoming transactions (shapeshift, bittrex or whatever source of SC)
It can be confusing you receive a different address every time you push the button. But your wallet can and will have a lot of different addresses that are all valid (and do not expire) for receiving SC.