The CutePDF Writer doesn't have the possibility to add passwords to created PDF files. You will need the Professional version for that. You can try it for free using the link posted below, but I don't think that all the features will be available for this procedure.
Try page: http://www.cutepdf.com/products/cutepdf/pro.asp
Another solution is to encrypt the file and add password by creating a RAR or ZIP archive. It's more powerful and very hard to crack.