Right now, there is no way to stream Friends through a streaming service like Netflix (who lost the series in January 2020), Hulu or Prime Video. It is set to be added to HBO Max later this year, but that streaming service is not launching until May 2020.
There are still ways to stream the series, but for those who want to have no complications with streaming it and not have to worry about other streaming services getting the series, iTunes is currently selling it for $80. The price for it is normally $130, so this is a nice discount.
The purchase can be made from either the iTunes or Apple TV apps. If you do purchase it, you will end up watching it from the Apple TV app.
Let us know if you plan on buying the show today from iTunes because of this nice winter sale they are having right now.