If you want to prevent someone from sending you messages, seeing your profile, or commenting on your posts, blocking them is the most effective way to ensure they no longer have access to interact with you.

From Chat:

1. Open the chat with the person you want to block.
2. Click the three dots next to their name to open the options menu.
3. Select “Block” to stop all future messages and interactions.

From Their Profile:

1. Search for their username and go to their profile page.
2. Tap the three dots in the top right corner of their profile.
3. Choose “Block” to prevent them from seeing your posts, interacting with you, or accessing your profile.