How do you connect to the wifi on your Mac

my Mac doesn't have that little box at the top right so I need to use a blue cable so I put I use a DSL modem to connect to the Internet and then I pressed continue and I entered the right information and pressed enter but it says the information I put is wrong so I put more choices and I pressed that I have a static IP assigned to me and I entered the information but it still says it's wrong

Report as