You can create rules in multiple ways.
- Long press on any message, then tap on the block icon in the options bar on the top. When you long press on one conversation, you can easily select multiple messages and tap on the block icon to create a spam rule for all the senders currently marked.
- In a conversation, tap on the 3-dot-menu on the top right and then tap on “Block & Report”.
- To create advanced filters, go to your Block section on the top right corner > + sign > 'Block number series' or 'Block an SMS sender name'.