How to add my Amazon sellerID and MWS Token into asinzen web portal ?
1. Go to asinzen web portal https://app.asinzen.com
2. Log in with your email and password
3. Click on Your Profile name and then click on Manage Marketplaces
4. Type you Amazon SellerID in the "input your SellerID" field and your MWS token in the "input your MWS Token" field
If you are unsure where do get your sellerid and MSW token click to follow this tutorial here