My template

Hi, can you please tell me how to create my own template?
i did copied files, like showed into the dahsboard:
Doriți să utilizați propriul șablon? Copiați toate fișierele din wp-content/plugins/woocommerce-pdf-invoices-packing-slips/templates/Simple in folderul temei dvs. în wp-content/themes/electro-child/woocommerce/pdf/yourtemplate pentru a le personaliza

But i don’t see anything changed and how can i personalize template.
I would like to add my logo to the invoice, and a new line like: Customer Billing

The page I need help with: [log in to see the link]