First of all what r u using windows phone or lap or a desktop which version of windows r u running ??
Well i am giving a tutorial for lap/desktop running win 10
1. Click on the wifi icon on the taskbar
2.There r two options wifi n airplane mode click on wifi
3. U will see available wifi above in the list then
4.click on the wifi u want to connect
5.there u can click on connect.
Please join WC to reply about which device r u using n if u were using a lap then were u successful please let us know...