Programming a module to handle multiple button clicks vb

I'm programming a vb form to allow the user to play tic-tac-toe using a form. I've set up a table (just to make it look like an actual game) and have put buttons in this table. I'm new to programming so excuse me if this is a really easy fix but I wanted to produce a solution in the simplest way possible. Therefore, I used a module which I want to handle each button click instead of writing out code for each button.

Code:

Private Sub Btn_Box6_Click(sender As Object, e As EventArgs) Handles Btn_Box6.Click
        ChangeTxt()
    End Sub

(Example of one of the button click conditions )

Sub ChangeTxt()
        If Form1.Active_PlayerTxt.Text = "X" Then
            PlayerOne = True
        ElseIf Form1.Active_PlayerTxt.Text = "O" Then
            PlayerTwo = True
        Else
            MsgBox("Please enter X or O to decide the player!")
        End If
        If PlayerOne = True Then
            Form1.Btn_Box1.Text = "X"
        ElseIf PlayerTwo = True Then
            Form1.Btn_Box1.Text = "O"
        Else
            MsgBox("Please enter X or O to decide the player!")
        End If
        Form1.Active_PlayerTxt.Text = ""
        PlayerOne = False
        PlayerTwo = False
    End Sub

(That is the sub routine ) So basically as you can see, this currently only changes btn_box1, but I want it to change each separate button (btn_box2) when they are clicked instead of just changing btn_box1. Is there a easy way to do this?