Open Lightroom
Go to the Develop module
Click the Presets panel
Click the plus icon next to Presets
Select Import Presets
Choose the preset file
Click Import
Find the preset in the Presets panel
Click the preset to apply it to a photo
Open Lightroom
Go to the Develop module
Click the Presets panel
Click the plus icon next to Presets
Select Import Presets
Choose the preset file
Click Import
Find the preset in the Presets panel
Click the preset to apply it to a photo