help with my phone ( sun jet sj816 ) ( Chinese phone)?

on sms text .. here is what i did
sms > sms settings >sim1 settings>profile settings>sms settings > once i went through all that it gives you a number ( like a phone number but not Ur's ) i accidentally erased the end of it and now i can receive sms txt but not reply
i got the phone in the mail today and i don't know much about it yet

to show what phone it is here is the link of a pic of it ( mine is the pink it has led lights )
http://www.google.com/search?rlz=1T4ACEW_en___US448&q=sunjet%20sj816%20p hone&gs_upl=0l0l0l9384lllllllllll0&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi

i also went to the website the came on a paper with the phone but it says the site is broken
also when i tried the reset my phone it ask for a password and the phone didn't come with a password