Blocking WiFi Networks

[ghall]

How can I block certain WiFi networks to keep my Mac from connecting to them. There's a wireless network at school that doesn't work, so of course that's the one my Mac automatically connects to.

 

[deathshrub]

 

[ghall]

That is checked, but it never asks me.

 

[deathshrub]

Click advanced, select the name of your school's network from the list, and click the minus button.