HOW CAN I FIND OUT?? I have so many accounts with so many different wallets i do not remember what address i used on sign up and there is no option to change it? After as long as this pool has been around why is it still so medieval?
When you withdraw it tells you the address. Or you could contact the pool admin via the options on the site and they'll sort things out. Addresses are unchangeable to prevent hackers from changing them - generally the onus is on the individual to ensure they own the keys to their addresses. But you can email the admins for special requests as mentioned.