How to create source file for haskell (ghci)

I created a file in a text editor on mac called: 1stfunctionite.hs

using the function:

doubleX x = x + x 

      

        
        
        
      

    

Then they saved it in my documents. Then I went to a terminal called ghci

and entered

:l 1stfunctionite

      

        
        
        
      

    

In the prelude, however, an error appeared:

target ‘1stfunctionite is not a module name or a source file 

      

        
        
        
      

    

How do I create a source file with this function inside, so I can use it in the terminal in prelude?