how i can lock worksheet with password ?

If you need to protect a worksheet with a password, you cannot do this directly. But you can create an xls template with the password added, and maybe other default data and formatting, use ExcelDocument.easy_LoadTemplateFile method to load the file, then update the file by adding more data to it for example, and finaly save back the file using ExcelDocument.easy_WriteExcelFile method. See Tutorial9 from the manual, chapter EasyXLS Basics/Import Files/Import from xls Files.

EasyXLS tries to preserve as many as possible unknown features when a file is loaded. The password is one of them.