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.
It's not too bad for such a cheap camera, but I didn't use flashlight on players while playing and I was a bit away and zooming when taking the shots from stage -> flash was useless/not very powerful I guess