A cash register may signify that it is time to cash in on a business deal and usually is a sign of money coming in. On the other hand, it may be related to your concerns about making a profit in business.
A cash register whose drawer is stuck may remark on your inability to make money.... Ariadne's Book of Dream
If you dream of registering to vote or of signing up for something, then this represents a willingness to allow that, which you’ve signed up for, to influence your life. Consider what you are registering for so that you can understand what you are subconsciously saying “Yes” to.
If you dream of a cash register, see Cashier.... Strangest Dream Explanations