Hello and welcome to LinuxQuestions,
Please refrain from using words like urgent in your posts, it's only urgent to you and not to us who are all volunteers putting in our free time to help out Linux users with their questions and problems. As another advice, search the internet first to see if a manual is available. LQ is not the place to turn to looking for step by step guides and howtos. You'll find those on the internet in abundant numbers, for example:
setup ZTE modem Ubuntu
on the Ubuntu forums
If you have problems following a guide you've found on the internet, that's when you'll encounter LQ users at their best.
Looking forward to your participation in the forums. Have fun with Linux.
Kind regards,
Eric