Giving any answer to such a vague question could have severe consequences. There isn't enough space for the 'BOOK' I'd have to write to cover all the various aspects necessary.
Your question is incomplete. What kind of money and from where?
The real questions are from where? What is your age? How much are we talking? Why do you feel you need it? What was it initially invested for and has that need changed?
If I may assume you are asking from the standpoint of being in a 401(k) plan and you want to know "How to draw your money that is in the plan out to do something else with it.
First if the 401(k) plan you participate in allows it, there are a number of different ways one can get their or their employers money that had been contributed on your behalf.
Generally, it is possible to get distributions for any of the following reasons provided that the plan document says that you can. The possible reasons are: if you terminate employment because you quit or are laid off, you become disabled, if you die, your beneficiaries will likely be able to draw your money out of the plan, you may also be entitled to a pre-termination distribution even if you are still working for the plan sponsor, your employer. In addition, while you are still working, you can get a distribution if you have passed Normal Retirement Age, also if you are still working you may be able to take a participant loan from the plan, but it must be paid back timely otherwise the money may become taxable if you default on the loan with out curing the default on a timely basis, and you may also get a Hardship Distribution if you qualify.
As I said above, in order to qualify to withdraw money from your account, the plan document must allow it and you also must meet the criteria that is set forth as the requirement(s) you must meet before you can access some or all of your account monies.
The best thing for you to do is to request a SPD ("Summary Plan Description") from your employer or from the employer's benefits department. A full copy of the Plan document may be helpful to you also. And of course, if your employer has a personnel department, it would be a very good idea for your to pay a visit to that department and ask your question of them.
I hope this has helped you. Good luck to you.