To edit generated invoices in Giddh log in to your Giddh account.
To search anything in Giddh just press Ctrl+G (for Windows) or Cmd+G (for Mac)
Press Ctrl+G/ Cmd+G and search "Invoice"
Now click on the Invoice number and you can see the preview of it
Click on the Edit button
Here you can edit the customer details
You can edit the Product/Service description like Quantity, Rate, Amount, Discount, Tax
Now click on the Update sales button