Click through the slides until you find a character you want to voice. Then you remix and you can record yourself saying the lines. If I think your voice fits, I'll comment on your project and let you know what lines you'll need to record. Keep in mind, some may have you record a LOT of lines, so make sure you're up for the task.
I tried “My female voice” go to that slide and the recordings will start playing. I am also a middle school girl so I thought I would work good. ( You might have to click the green flag again when you are on the correct slide.)