Depending on the situation, both methods can be very useful. Here are steps for both methods
Method 1 - Start from Scratch
Step 1
Go to the Home Panel and scroll until you see the Other streams section. Then click on the plus button to create a new stream
Step 2
You will then be prompted to create a stream as usual and adding a name and description (optional). There is just an extra step to add the people who you would like to share the stream with
Method 2 - Convert an Existing Stream into a Shared Stream
Step 1
To turn a stream into a shared stream, first find the stream on the Home Panel under Other Streams.
Step 2
Once that stream is selected, click on the Share button in the upper right hand corner of the stream.
Step 3
Add the other users to the stream.
Step 4
Then you should be all good to go! View the stream in the Others section of the Home Panel