This code should log you in, provided you enter the correct values for these two lines:
username.Value = "Test"
password.Value = "Test"
Open the VB Editor by pressing Alt+F11 and insert a new standard code module. Paste in the following code:
Option Explicit
Private Sub LoginToEpay()
Dim IE As Object
Dim username As Object
Dim password As Object
Dim objCollection As Object
Dim i As Integer
Set IE = CreateObject("InternetExplorer.Application")
IE.Visible = True
'Navigate to the website
IE.navigate URL:="https://www.epay.com/epayweb/user/login"
'Wait for page to load
Do While IE.Busy Or IE.readyState <> READYSTATE_COMPLETE
Application.Wait DateAdd("s", 1, Now)
Loop
'Username and password elements have IDs
Set username = IE.document.getElementById("username")
Set password = IE.document.getElementById("password")
'Login button doesn't have an ID so we must use name
'This returns an array of items that have the name
'login
Set loginBtn = IE.document.getElementsByName("login")
username.Value = "Test"
password.Value = "Test"
While i < objCollection.Length
If objCollection(i).Type = "submit" Then objCollection(i).Click
i = i + 1
Wend
End Sub