how to lock my business in manager software?
By lock do you mean password protect, you can’t. Just like you can’t lock your email client, word processor or spreadsheet programs. Your computer user password locks access to these.
but in busy software there is a good way to lock business
If you are using the desktop edition, you are responsible for yourself. If you are using the server or cloud editions, individual users must be defined with separate passwords.
Responses so far assume you are talking about access to the program itself. If, however, you were referring to locking data within Manager to prevent changes, see this Guide: