Row Offset And Writing To Next Line In Activesheet

I have a ComboBox. When a user selects an item from the ComboBox and clicks a command button (Add Button) the selection that the user selected writes to a row in the active worksheet and then resets the ComboBox allowing the user to make another choice after clicking the "Add" command button. I am trying to remember how to write the code for row offset so that when the user makes their next selection from the ComboBox and clicks the "Add" command button it puts it the selection in the next row of the active spreadsheet thus creating a running list of the users choices. Here is a line of the

Private Sub cmbAdd_Click()
ActiveSheet.Cells(2, 3) = cbxSeverity
cbxSeverity.Value = ""
End Sub

After the tcbxSeverity.Value ="" line I was testing trying to get to the next row by using something like this:

Private Sub cmbAdd_Click()
ActiveSheet.Cells(2, 3) = cbxSeverity
cbxSeverity.Value = ""
ActiveCell.Offset(1,0).Select
End Sub

I know that this code is incorrect but I cannot remember how to offset or check Rowsource to move to the next line.