Yeah, shoot. If you go into an external graphics program (Photoshop-expensive, GIMP-free, or something like Paint might work)... either download the Ancient Map Tiles (if they are enabled /licensed for download), and open your background in the graphics program, and add the script text.... OR just keep the scroll background in roll20 and make just pure lettering in the graphics program (export as PNG with transparency so that only the letters show, and the scroll background will show underneath it once you upload the lettering). FWIW, I use the Contrail font that exists in Roll20 for writing on maps. It seems to show up best and is compact in horizontal width so you can write a longer title. It does not appear "script" at all though.