In order to add a sender account, first, you need to log in to your account and then click on the “settings” section on the menu that is located on the left-hand side of the page.
Then, you can enter the “Sender Accounts” section by clicking on the “Sender Accounts” on that page.
After that, you can create a sender account by clicking on the “Create Sender Account” button.
Lastly, you need to enter the required credentials to create a sender account as shown.