Qsys Component Editor for Custom Logic

Here, try this example to get you started (its in VHDL, but it should be easy enough for you to understand), and then use the tutorial I linked to above. You can use that to read a PIO (your button) and to write PIOs (LEDs).

Cyclone IV GX Starter Kit (C4GXSK) 'basic' design
-------------------------------------------------
3/20/2013 D. W. Hawkins (dwh@ovro.caltech.edu)
This top-level basic design can be used as a template for all
other C4GXSK designs.
1. Unzip the zip file, eg., into
   c:/temp/c4gxsk_basic/
   
2. Start Quartus II (eg., 12.1sp1)
   Select the Tcl console (it can be made visible using View->Utility Windows->Tcl Console)
   
   Change directory to the zip folder
   
   tcl> cd c:/temp/c4gxsk_basic
   
   or if you like to copy-and-paste from the Windows Exporer
   path, you can use paranthesis to 'escape' the windows path format
   tcl> cd {c:\temp\c4gxsk_basic}
   
   
3. Run the synthesis script
   tcl> source scripts/synth.tcl
   
   and you will see the output:
   
   Synthesizing the C4GXSK 'basic' design
   --------------------------------------
    - Quartus Version 12.1 Build 243 01/31/2013 Service Pack 1 SJ Full Version
    - Creating the Quartus work directory
      * C:/temp/c4gxsk_basic/qwork
    - Creating the design files list
      * create a new c4gxsk project
    - Applying constraints
    - Processing the design
    - Processing completed
   
  The Quartus messages window outputs a few warnings.
  related to invalid fitter assignments. Those warnings are due to
  the transceiver channel pin assignments that need to be commented
  out, since Quartus does not allow you to simply disable (tri-state)
  those pins (you have to connect them to a transceiver block).
4. Download the design to your board.
   Per the comments in the top-level file src/c4gxsk.vhd
   
   -- This basic design implements the following;
   --
   -- * LED connected to PB
   -- * LED blinked by a counter clocked by the 50MHz osc
   -- * LED blinked by a counter clocked by the 125MHz osc
   --
Enjoy!
Cheers,
Dave