Change a value of a script from other script

Hi, i have a question, how can i access to a property of a script and change it.

For example:
16813-rotate.png

I have a script called Enabled that disable Rotate Script, and it works, but how can i acces to Speed property and change it trought another script? lets supouse one called Speed that change value of speed
Thanks

see Accessing variables in other script Components

on this page http://docs.unity3d.com/412/Documentation/Manual/Scripting.html

also, you could have found this by putting the title of your question into Google, like robertbu said.