coupons & affiliates proble

Hello, i just downloaded and installed opencart. first of all i must admit. it's amazing.
i'm trying to test the coupons and affiliates. but unfortunately i'm facing some problems. i'm not sure it's bugs, it may be configuration issues.
1. when i'm checkout and enter the coupon code, i doesn't get the discount.
2. when i'm entering the website with the affiliate link but i can't see the deal under the affiliate account.

i will appreciate any help