To connect your Walmart seller account with Sumtracker you have to
Go to "Connect new channel" from the Dashboard
Click "Connect Walmart" on Walmart card
You will be redirected to Walmart seller portal
You have to login to your Walmart account, and approve Sumtracker to connect with your store
Once you approve, you will be automatically taken to Sumtracker and your store will be connected
Please note: Sumtracker supports single shipping node for Walmart. If you have more than 1 shipping node on Walmart, please get in touch with Sumtracker support to see if Sumtracker can work with your Walmart store.