Open it and tap the menu button > New > New script and give it a name and let it open with "SM editor"
After the line #!/system/bin/sh type this:
chown 1010.1010 /data/misc/wifi/wpa_supplicant
click menu > save
now from the list find the file you just created and click and hold pressed over the file until the menu is open.
Open As...> script executable
click hover the help button, to see the help about the icons:
basically after memorizing what each button does, you have to select "run as root" (the icon is identical to the super user icon if you have your device rooted), and the other option is "run at boot" (the shape of the icon is a mechanical wheel).
After that every time you start your android, wifi will work because that script is runned at startup.
Be careful not to remove by mistake the file of the script from your SD (you will need to have it their for this to work)
Hope it helps!
many people have wifi issue, is it possible to fix it please?
thnx to racoq