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.
Yes you can, but I would recommend the MSI wind over any of these mini note books, or the Advent 4211 (A cheaper re-badged msi wind) as the keyboard layout means you can make smooth transition from your desktop.