Access my computer from another computer

I am going to be visiting my daughter and want to use her MAC to access my computer. I don't have a laptop. I tried to access my computer as a guest. It partially let me in, I had to creat new password, then got a number sent to me on my iPhone that I entered, then it said = "The Password you use to unlock this MAC will also be used to access saved passwords and other sensitive data you store in iCloud' The asked for a password, I tried every passwords I can remember, but no luck how do I access my computer from a mother computer?