Hi, welcome to justanswer.com! My name is Mike.I am going over your question and will be with you shortly.
You need the passcode for what exactly, I am confused?
I don't understand so you don't have a WiFi network router at your home? Who is your internet provider?
OK so just turn on your hotspot and connect using the password ***** your phone's settings
You just make a new connection.
When you are home I can help you by remote
Go to System Preferences / Network / choose WIFi then Advanced choose your old hotspot and then click on the minis sign to remove it then try to add the new hotspot and put in the password.
Do you still need help? You never replied.
Oh by yourself eh. OK great! If you are satisfied, please kindly provide an OK or Above Rating - so I get paid. Keep in mind you can always come back to this page at any time regarding this question for no extra charge. Thanks!!