I`ve been trying to figure out how to run a certain script by pressing a key. Also if you could add how to make it so the owner of the game can only run it then thanks.
This question has been closed because it is not constructive to others or the asker. Most commonly, questions that are requests with no attempt from the asker to solve their problem will fall into this category.
Why was this question closed?
Use UserInputService for the key part, found here: https://wiki.roblox.com/index.php?title=API:Class/UserInputService/InputBegan
Then use If statements (conditional statements) to detect the players name and or UserId: http://robloxdev.com/articles/Conditional-Statements-in-Lua
Then you'd want to change the WalkSpeed of the Humanoid, properties of the humanoid: http://wiki.roblox.com/index.php?title=API:Class/Humanoid