How to activate and install Minecraft Java Edition?

• From a web browser, go to this address: https://www.minecraft.net/en-us/redeem
• Click on “REDEEM JAVA EDTIION”.
• Register for a Mojang account or login if you already have an account.
• Type in code from your email. Please remember to type the key without spaces nor pauses.

You can find additional information regarding redeeming Minecraft gift codes here: 
https://help.minecraft.net/hc/en-us/articles/360035130911-Redeeming-a-prepaid-card-or-gift-code#redeem