New milestone

[la-soleil]

Hello everyone

I have received a new job offer and I was really excited about it and happy to the far i didn't read it very well and I asked for less money than what was in the original post.. I wanna ask the client for the money and I'm embarrassed.... excuse me I really know it's my mistake can you help me please or advise me it's not big amounts both ways 

I must mention that the client hired many people for the job not only me 

And it needs much more time that it's mentioned in the post and it deserves more money and the deadline is almost one day ... I will do the job because I like it but If you can advice me or help me to ask for more money in a professional way I would appreciate it