To use a graphic which should be on air all the time on a certain layer, select the channel first and then activate the "Layers & Engines" tab. There's a column labelled "Infinite Layer". Click "Choose Infinite Graphic…" for the desired layer. A file browser will appear which allows you to select the graphic file you want to have on air all the time. This can be a QTZ, composition:builder or image (JPEG or PNG) file. Restart all user interfaces which are connected to this channel to allow them to reflect the changes.
A ".qtz" or ".composition" real time graphics template used as an infinite graphics must contain ONE stop frame, otherwise the graphics will go off air once the composition reaches its predefined composition end. Refer to the composition:builder