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.
Gone are the days where all these (+100s more) guys would duke it out at Gliwice for a Celeron PC with 15" monitor and 128mb RAM :E
Now they're all spoiled with $$$