You can send mails to the players who posted their mail address on their public sheets... Nothing more.
Second question: I guess you are talking about
this level (only to be sure it is the same^^). Try to hit the pineapple (the evil "jumping fruit") through the wall (requires a bit of timing and a bomb as close to the wall as possible), then hit it again when it is at the bottom. Then it is just going through the level as quickly as you can... Kill the strawberries as late as possible - as long as they are both alive, they are not too dangerous

Get the right one down, then the other one and then kill them (not together... this will be impossible^^)
It only takes a bit of luck, good aiming, ... and fireball-avoiding-skill^^ If you can go through it dying only once, it is okay