A WiFi connection potensWL has popped up on my wifi settings. I do not know what this is but want to delete it. How do i do it? I have a Samsung Galaxy tab 2.

Hi
To connect to a WiFi system, you may need 3 pieces of information:
A username
A password
An encryption key
Once you have successfully linked to a WiFi access point then your tablet will remember the settings until told to forget them. To do this, tap on the connection in >Settings >Wireless and networks and ou will be given 3 options, Connect, Forget, Cancel. You need "Forget".
A lot of the time you may only need the encryption key, and if the tablet detects a WiFi access point then if you tap on that in wireless settings then it will either connect automatically or ask you for some sort of code - the encryption key. If this is not entered correctly then it will return an authentication problem/error. In order to connect you have to have this code.
It is worth remembering that your tablet will always notify you (via Wireless and Network settings) of all wireless networks that are within ita range.
Cheers