Printing Logo using LNUI

Dear all,

We need help with logo.
We implement LN 10.5 but still we use worktop.
We developed reports, such as Purchase Order and Sales Invoice using 4GL.
But with LN UI when we print the Purchase Order and Sales Invoice the logo does not appear.

We are told that we must use LN studio, but this is a new tool.
We have installed and configured LN studio, but still have problem operating it.

Need your help how to make logo appears using LN studio.
Or is there any workaround to make logo appear when printing with LN UI.

Thank you.

Hanny