Hi guys, it took me some time but finally I worked it out. So now, I want to share my experience with you.
First you need to select in your dashboard from wich card do you want to withdraw. Once you are there, you have to select send to cryptocurrency or utility token.
And then scroll down and select BAT. It will appear in the second list.
The next step is to complete your adress and the amount of BAT you want to withdraw.

In addition, you can tick the box to use all available funds in that card. (It will appear after put your address).
As you can see in the image below, Uphold is not charging any fees for withdrawing BATs 👍
Finally, you have to click on confirm buttom and that's all. Then you can follow up the transaction on the Etherscan until complete and enjoy your BATs 👌
Hope you found this information helpful and saves you some time.
See you next time 👍