1. Download and install the PuTTY app.
2. Launch the PuTTYgen app.
3. Click Load to upload a file with a private key in a PEM format.
4. A window opens for selecting a file from the local storage.
5. Select the file and click Open.
6. A hint will appear.
7. Click OK, then click Save private key.
8. Save it on your device for future use.