If you want to use your Lightroom Desktop presets on Lightroom Mobile, Adobe has made it easier for you to add and sync presets between devices.
Step 1 is to have Lightroom Desktop installed on your PC/Mac and phone, make sure you're logged in the same account on both devices.
Step 2: Download and Install the Lightroom Presets into Lightroom Desktop
..aaand that's it! Log into your Lightroom Mobile, load an image, tap 'Presets' and under 'Libraries' scroll until you find the presets starting with 'Flow' (our presets)
If you need help importing your presets into Lightroom Desktop, read this article.
If you'd like to install the presets without Lightroom Desktop, read this article instead.