How do you search for a thread in 4chan?

I just cannot figure out how to search through the threads for a specific keyword, is that possible in 4chan? TIA

>>1
1. Pack up your computer.
2. Take it back to the store where you bought it.
3. When they ask: "Why return?"
4. Answer: "I am too stupid to own."
5. ????
6. PROFIT!!!!