To prevent unwanted contact from another user, you can use the Block option. This will disable the user from being able to call or send you messages.
There are two ways to block a user:
Open the profile page of the user
Tap on the 3 dots icon in the upper right corner of the screen
Select Block
or
While streaming, long tap on the user's name in the stream chat
Select Block
To unblock a contact:
Go to your profile page
Go to Settings
Select Privacy
Tap on Block List
Find the contact you want to unblock and tap on Unblock
How to Report a user
You can also Report inappropriate content or a user violating the community rules.
From the profile page:
Open the profile page of the user
Tap on the 3 dots icon in the upper right corner of the screen
Select Report
Select a reason
Tap on Submit report
From a stream:
While watching a stream, tap on the streamer's name in the top left corner of the screen
A mini profile will open at the bottom of the screen. Tap on the 3 dots icon in the upper right corner
Select Report
Select a reason
Tap on Submit report
From a stream chat:
While watching a stream, long tap on the user's name in the stream chat
Tap on Report
Select a reason
Tap on Submit report
To report a post violating the Community Rules:
Open the profile page of the user
Open the post you want to report
Tap on the 3 dots icon in the upper right corner of the screen
Select Report
Select a reason
Tap on Submit report