To ask a follow up question in a thread, you usually reply directly within the same conversation rather than starting a new one. In Perplexity AI, this keeps the context attached so the next answer can build on what was already discussed. If there is a chat or thread view, look for a reply box at the bottom of the existing thread and type your new question there.
If you want the answer to focus on a specific earlier point, it helps to quote or briefly restate that part so the system knows what you mean. For example, you can ask, “Can you explain that last part in simpler terms?” or “How does that compare with the earlier option?”
If you do not see an obvious reply field, check the current page for any help, settings, or interface tips, since the exact layout can vary by device or version.