One way...this will handle 3 TextBoxes, modify or add to suit.
Right click on your sheet tab, left click on View Code, and paste the following procedure into the large white area that is the worksheet module. Press Alt+Q to return to the worksheet.
Private Sub TextBox1_KeyDown(ByVal KeyCode As MSForms.ReturnInteger, ByVal Shift As Integer)
If KeyCode = vbKeyTab Then TextBox2.Activate
End Sub
Private Sub TextBox2_KeyDown(ByVal KeyCode As MSForms.ReturnInteger, ByVal Shift As Integer)
If KeyCode = vbKeyTab Then TextBox3.Activate
End Sub
Private Sub TextBox3_KeyDown(ByVal KeyCode As MSForms.ReturnInteger, ByVal Shift As Integer)
If KeyCode = vbKeyTab Then TextBox1.Activate
End Sub