Userform Interface For Holiday Planner

I have one workbook with two worksheets (Jan-JUly and Aug-Dec). I am using a userform to add data into worksheet ("Jan-July"). But I do not have any clue - How do I update the other worksheet (same data like name,join year etc)worksheet("Aug-Dec") at the same time. I used two worksheets because worksheet doesn't support 370 columns, and to make my life easy. UserForm add data into Column A to M (worksheets Jan-July), rest is done manually. I have also attached the file.

Private Sub dataAddButton_Click()
Dim dataCheck, eMsg As String
Dim strLastRow As Integer
Dim x As Double
strLastRow = xlLastRow("Jan-July")
'get Last Row
With dataInput
'dataInput name of userform
If (.fNameBox.Value <> vbNullString And .fNameBox.Value <> vbNullString And .joinYearBox.Value <> vbNullString) Then
'textbox validation value can not be empty......................