1. First you will need to activate your BQool account. When you sign up for a new BQool account, BQool will send you an email. Click on the activation link in the email to activate your BQool account.
2. After your BQool account has been activated, log in to your BQool account and go to My Account > Marketplace Settings and follow the steps listed to sign up for MWS access. 
3. Select your marketplace
4. A new window will open to take you to log into your Amazon Seller Central. 
5. Select I want to use an application to access my Amazon seller account with MWS.
6. Enter the information given according to the marketplace you're participating in. Click Next to submit. 
7. Accept the license agreement and click Next.
8. You will see your Seller ID and MWS Auth Token now. Copy them or make a note of them, because you will need them again later. 
9. Go back to the BQool website and enter your Seller ID and MWS Auth Token. 
10. Click Save to finish.

Note: It could take a couple of hours to download all of your Amazon seller account data.