Import a board or a platform from the Boards Manager

If you are using the Arduino IDE 1.8.x and you want to import a board or a platform then you need to use the Boards Manager.

Follow these simple steps:
- Launch the Arduino IDE 1.8.x.
- Select Boards Manager... from Tools>Boards menu.

1 Board manager

- Search your board or platform. 
- You can scroll the drop down menu or write the name in the top field of the page.

2 select the platform

- Check the version and click on Install.

3 select the version

4 installing platform

- Wait that the installation is completed

5 installed

- Now check your board in  Tools>Boards menu.

6 new platform

If the new board doesn't appear, then restart the IDE.