Law / Allegro for non-Polish users -- Cancel order, bank transfer, contacts for help, etc. [19]

Hello!
I'm an Erasmus student in Gdansk and I'm trying to use Allegro for the first time to buy some things, but the website is not very easy to understand and it's just in polish; google translator is terrible, and so I cannot understand many things.

1) How can I cancel some orders I did by mistake (they're still not completed)?
2) I read that payment via credit card is possible only for experienced members, and that new ones must use bank transfer. If I go in a bank here (BPH, or ING direct, for example) with the IBAN code of the seller and the cash I should be able to do the transfer even if my bank account belongs to a different bank (an italian one) isn't it?

3) How can I contact the website's help? When I try to do it they say me that I have to fill in a form, but I cannot open it. Is there an e-mail address to whom I can just send some simple questions?

Thank you,

Michele