text logo on top of the object

Hi there
i need to write three letters on top of the glass object. What is the easiest way to do that. I’m trying use simple texture that i’ve created in gimp with alpha channel but when i wrap it over the selected faces the whole texture becomes black. see picts enclosed.

i need same as here

Use the texture alpha channel as the mix factor

works perfect, much thnks for help :slight_smile: