need H-E-L-P

[idan0304]

i am a UN citizen (italy) i came tow months ago with out a visa i filled the green form and i got a stamp and they let me in i have two questions:

1.i want to extend my visiting i dont know what to do cause i dont have visa on my passport???

2.how long can i stay in the USA without visa???

3.If i try to go to canada or mexico they will let me in again???

urgent plz i need help...

thank you for the helping ....

[waitin_toolong]

if you came on visa waiiver you cannot extend it.

you may be allowed another 90 days on reentry but no guarantees