Kirstie, do you put a tiny bit of gas in the blob first to make it stand up? If you exhale a single breath into the blob it will stand up but is not bouyant enough to make any odds. Then take the reel off its clip and sort it out. If you put your arm through the loop at the bottom of the blob you have both hands free to undo the reel's brake. Now join the reel and blob with a double ender.
Reel (free to go) in the left hand then inflate with right....
Either that or grow another arm
Chris