The cloud-based version of Lightroom, which this forum is, does not utilize presets. You might want to post your question in the Lightroom Classic forum and include more information on the preset you mention.
This link has some video demos showing how to install DNG presets on desktop or mobile. DNG files simply contain a set of editing steps. So you need to import the DNG open editing and then click the plus icon in the presets panel to save to the presets list.