How to keep record of invoices printed in separate database sheet (Please Help)

There are three important sheets in the file attached with this thread.

1. M-Database
2. M-Entry
3. M-Invoice

What required is that when somebody enters data in M-Entry sheet and press the Print Invoice macro button then excel post the data entered to M-Database to the next row where data has already been entered and to the M-Invoice sheet and then take print of M-Invoice sheet. Tried this using macro but it work for first posting but in second posting it post on exactly the same row of M-Database where it posted earlier.

Please tell how i can fix this. Knowing the fact that i can't do VB :-/