Hello guys.
I want to remove this white backgound.
can I remove this without using photoshops or any graphic tools?
If It can possible let me learn the process.
I tried several ways in my knowledges in ue4 material tool,
I can’t make it.
Just I want to change this white background to trensparency.
Thank you guys.
Select the whole white area and use that tool! 
Edit : sorry you meant in Ue4. You could make a mask to hide the whole white surface! You’ll have to use an image editor anyway! Good Luck