ui button function and onclick event

how can i give this ui button an onclick event as well as a keyboard return key ,i think i am not being clear enough ,i want my game to have the same function when i click return and when i click the button on screen ,i for keyboard return one for screen button ,basically how can i give 2 key for same function` public Transform eggpoint;

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 void Start()
 {

 }


 // Update is called once per frame
 void Update()
 {
     if (Input.GetKeyUp("space") || Input.GetMouseButtonDown(0))
     {
         GetComponent<Rigidbody2D>().velocity = Vector2.zero;
         GetComponent<Rigidbody2D>().AddForce(jumpForce);
     }
         if(Input.GetKeyDown(KeyCode.Return))
         {
             Instantiate(Egg, eggpoint.position, eggpoint.rotation);

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%|69678579_17|% %|1246395602_18|% }`

as you can see i have instantiate function above and now i have the return key from keyboard to execute this fucntion i want my ui button to have the same function how can i achieve this.