Unable to do test transaction using sandbox test account

Ok, I have been trying to fix this issue for a whole week now...

I am trying to test buy my product from my website using the test account in paypal sandbox to make sure that customers are able to buy it.

But something goes wrong when i try to buy my product using the sandbox test account.

here is the process of what i did:

1. Logged into paypal.com using my real account.

2. Went to the developer.paypal.com website > Dashboard > under sandbox, clicked accounts.

3. I created a personal sandbox account with 100,000$ fake dollards in it.

4. Once the sandbox account has been created, i then log out of developer.paypal.com/

5. I go to sandbox.paypal.com and log in using my sandbox test account that i just created.

6. I proceed to my website: http://ift.tt/21ildnd > click on the courses menu tab. (i do not log in to my website)

7. In the courses page; http://ift.tt/1SUgYxU i click buy now.

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(Here is the problem)

8. I am then redirected to the paypal checkout page, but when i enter my sandbox test account user and password: user: stephanebeaulieu5000-buyer@gmail.com pass: addict123

it dosent work and a message appears saying:"Check your email address and password and try again."

I have followed the exact steps described on the paypal website explaining how to do a test transaction.

plz help me, this is imporatnt since i have to see if everything works great for my clients... i am losing money everyday that this issue stays unresolved...

Thank you! ;)