click submit button in web page through vba

Sub j()
Dim ie As Object
Dim doa As HTMLDocument
Dim HTMLdoc As HTMLDocument
Dim button As HTMLInputButtonElement
Dim i As Integer
'Set HTMLdoc = .document
Set ie = CreateObject("internetexplorer.application")

ie.Visible = True
ie.navigate "https://ebfpm.tsgwn.co.in/Prksoortal/login.jsp"

Do While ie.busy
 Application.Wait DateAdd("s", 1, Now)
Loop
'Set doa = ie.document
ie.document.getelementbyid("username").Value = "egh125"
ie.document.getelementbyid("password").Value = "**"

End Sub

'in web page the "continue" button code which i try to click is

<a class="button ok" tabindex="0" href="javascript:submitForm();">
<span class="submit-text">Continue</span>
<img class="arrow" src="img/arrow.png" alt="">
</a>

I have tried numerous variations of codes on this site to get my VBA to click on a button on a webpage ,but all the time i failed , Username & password was successfully filled using this code but i cant figure out how to click the Continue button, this is the code which is used