How can I reconnect this Mac to my wifi

I have tried all sorts of things this Mac just all of a sudden got off the wifi, phones and iPad are still connected. I am about to go crazy and buy a windows PC lol

In OS 10.7.5, you can try this.
Apple menu / System Preferences / Network.
On the left side of the new pane (if the padlock is closed, click it and enter your computer login password)  select Wifi and click the - (minus sign). You may be asked if you are sure you want to,,, etc. Say yes.
Next click Wifi and the + (plus sign). Answer the questions about the interface as wifi.
Then click Assist Me.
Next select Assistant.
The Mac will take you through the steps of creating a new wifi connection.
At this stage the password you will be asked for is the internet access password.

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