1. How to register as a seller & add Amazon Store ?

First you should register(join) as a seller by entering your amazon store info

Second Seller should add store to submit deals in Manage Promotion >> Store >> Add

Check below video

2. How to add deals(products) with voucher code ?

1) Select Product[deal] Add menu
2) Add Asin numbers per line and click create button
3) To enter voucher code for added product[deals], Click Product >> View Menu
4) Seller should select product group and enter discount percentage based on amazon promotion info
5) Select multiple or single code and start & expiration date in Voucher Tab
6) Enter related voucher code
7) That's all