Choose the caption bubble to begin. If you want to upload a custom bubble or alternative image then submit the caption first, then edit the comment and attach a "Place img". Once the image is approved you can use it by editing the caption again.
I don't think she really understood...We told her several times we came from NZ/Swe/UK, but she still insisted on saying we were from USA. It seemed like she didn't know where those places were unfortunately :/