Doubts regarding MSE - Starting an Attack on Titan Commander

Greetings, people of the internet.

So, I have very little experience with editors, and so far, MSE has been the one which lets you customize the most.

I was wondering, is there a way to include any image as a watermark mana symbol?

I'm starting an Attack on Titan Commander set, and I'd like to put the Wings of Freedom as watermark.

By the way, are the newer frames included in MSE, like this one? If so, what's the name of it?

Thank you.