sendkeys method not working!

I am trying to hit enter automatically using the sendkeys method.

However, it just doesn't work ... here are the different methods I tried ... none of these 4 methods worked:

1.) Application.SendKeys "{ENTER}", True

2.) Application.SendKeys "{~}", True

3.) Call SendKeys("~", True)

4.) Dim SKobj As Object
Set SKobj = CreateObject("wscript.shell")
Do While IEobj.Busy
wscript.sleep
Loop
SKobj.SendKeys "{ENTER}", True

I just don't understand why it is not working. Help would be much appreciated.

P.S.: The reason why I have to use sendkeys is that hitting enter is the only method to start a search on the following website (the button next to the search box does not react):
https://www.fitchratings.com/