Open the Minecraft Launcher
Sign in to your Minecraft account
Go to the Skins tab
Click New Skin
Choose a skin model
Click Browse and select your skin file
Save the skin
Select the new skin
Launch Minecraft
Open the game and check your character
On mobile, go to the Profile screen
Tap Edit Character
Select Owned or Classic Skins
Choose or import a skin
Save and apply it
On console, open the profile or dressing room
Select a skin from your owned items
Apply the skin
On Bedrock, use the Character Creator for custom options
On Java, upload a PNG skin through the launcher