Log in to AliExpress
Install AliExpress Assistant add-on for Chrome
Activate/click add-on and follow prompts, refresh page that appeared after clicking the assistant icon or Open THIS PAGE
300 points should appear
Click 'Redemption Center'
Click 'Redeem for Coupon'
Redeem 300 points for US $3 Coupon (Change Amount of Coupon to 3)