Not exactly sure what you're doing - but, do what you did to get the type with the white box. (I know, it's got a white box that blocks the photo. Do it anyway.)
Then, keeping that image selected go to:
Main Menu > Window > Transparency.
From the transparency window, there's a pull down menu, which by default, reads "Normal".
Change that to Multiply. The white will be interpreted as a transparency. --- There are other selections that are available to play with that may suit your needs better --- explore!
Doing it that way doesn't harm the photo and you can still edit/move the different elements.
If that doesn't get you what you want, post a jpg of the image with a description of what you want to do, as there may be another way to get you to where you are going… if there are color, or gradations involved.