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.
well, the man certainly has the right hardware. (not sarcasm)
KeyTronic keyboard, ie 3.0, SS 5Hv2s (not great at noise cancellation, but the best positional audio of any headset I've used, and I've used them all.)