Those pages Akash kindly shared are geared towards LR Desktop and not mobile users.
In short, Presets are imported into Lightroom Mobile by importing DNG images that have edit settings applied. After importing, open the image and tap the 3-dot button, and choose Create Preset. Give the preset a name.
Hopefully, your presets seller did provide some setup steps. If not, you can find excellent advice with clear steps just by web searching for "lightroom mobile import presets,"
There are sites and example videos on the web which can help with questions about how to deal with bundles of presets that come in ZIP files, how to transfer these to your phone storage and access them, etc.
I recently purchased two mobile preset packages and was trying to import them. However I was unsuccessful. I only have LR mobile version, not the computer version nor do I own a computer. Is this why I cannot import the presets to my mobile version? Or am I missing something? Am I out the money for those presets or is there still hope?