Make sure you have joined the Everyday Rewards program and signed up at https://www.everydayrewards.com.au. Remember your password. You will need this later to link your Everyday Rewards card to your BIG W account.
After setting up an account and logging into the BIG W website, select 'Account' from the menu at the top. 'Account' will only be an available selection once you have logged into the website.
Select 'Everyday Rewards Account' under 'My Account' in the left hand side navigation panel.
Select 'Link your card' at the bottom of the page.
You may be requested to login to your Everyday Rewards account. Enter your 'email or card number' and 'password' into the corresponding fields. Click 'LOGIN'.
An SMS will be sent to the mobile number associated with the account. Enter in the 6 digit code provided in the prompt from Everyday Rewards. Click 'VERIFY'. You will be redirected back to BIGW.com and your account will be linked.