There are two methods to connect to the wireless network on MacBook, as follows:
click on the “WiFi icon" on the very top of your MacBook and then choose your own WiFi network and connect to it
Then put your WiFi password(the password was made up previously on your wireless router) which is case sensitive and click on Join.
Click on apple icon system preferences network
Go to WiFi, click on network, then on the dropdown menu, and choose your own WiFi network. Here we take “tplinkwifi" as an example.
Fill in the password which is case sensitive and connect to your own wireless network.
Finally, the WiFi status would say connected when it’s successfully connected to the “tplinkwifi"