Read the phone instructions book. If you don't have instructions you should be able to download from the manufacturer's website as a PDF document which you can open in Adobe Reader.
Please note, some cheaper mobile phones do not have Wi-Fi. Only "smartphones" which have a web browser and can be connected to the internet have Wi-Fi. Cheaper phones which are only for making calls and sending text messages do not have Wi-Fi.
I cannot help you further because you have not included your phone's model number in your post. There are several different models in the GFive range - some models may not have Wi-Fi.