If the WiFi projector has an OSD, use it to change or display the current password. Unfortunately, there isn't anyone who can tell you the password for your devices. If you have the manual for the projector, consult it to learn how to change the password. If no manual is available, then I recommend you paste the name and model of your projector on Google. Type manual as well and then download the available PDF files. This way you will learn how to change its password to enter it in EZCast.