Here you can learn about how to post the voucher.
Login in with Fresa Gold, Navigate to Accounts->All Vouchers, select any voucher status as created(Fig.1).
2. Now click the Change Status button and select the New Status as Approved and click Save button(Fig.2).
3.Now the voucher status is Approved.(fig.3)
4. Now click the Change Status button and select the New Status as posted and enter the remarks and click Save button(Fig.4).
5.Now the voucher Status is posted Successfully.(fig.5)
Hope you got an idea about, to post the voucher.