To use this module, you need to:

#. Go to Accounting -> Configuration -> Settings and activate in section "Customer Invoices" option "Sale Receipt"
#. If you need only/also Vendor receipt go to Vendor Bills > Purchase Receipt
#. Go to Accounting -> Configuration -> Journals and you will find 2 new Journals for receipts one for sales and one for purchases, you can rename them, archive or delete for creating a new ones.