Click in Available Brands and select All Brands.
To filter for a brand, click on the Filter icon and search for the brand you are looking for. Once you find it, select the brand and click Ok.
You can see all the listed brands in this column. Scroll down to see all the brands. Once you find the brand you want to request data from, click on the left checkbox to select.
Here you can see more details of each brand, such as the Source, the number of Products, and the Last Updates.
Once you have selected a brand, click on Request Data.
In this column, you can see your request's status and each action in the Actions column.