Click on the blue Android,iOS or Windows label after successful build to download the app or you can scan with QR code scanner app to download directly to your device.I hope you find it helpful.
I want a link to send to my friends, for freely download.
can you help with that?
In your app page, right below the QR code there is a button that looks like a box with an arrow (on the right of the blue install button).
If you click it, it takes you to the share screen, just sent your friends that link.
Just be aware that they won't be able to install iOS apps unless you add their device UDIDs to the provisioning profile you use for building the app.