You were almost there.
Try this:-
Web01.Document.GetElementById("ctl00_ctl00_cpMain_cpMain_LoginBox_Email_Textbox").InnerText = me.strusername
Web01.Document.GetElementById("ctl00_ctl00_cpMain_cpMain_LoginBox_Password_Textbox").InnerText = me.strpassword
Web01.Document.Forms("LoginForm").submit
DJ