The talk page associated with an article is named "Talk:Example", where "Example" is the name of the article. For example, the talk page for discussion of improvements to the article Australia is named . The talk page associated with a page in another namespace is named by adding "talk" after the namespace label; for example, the talk page for is called .
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When viewing an article (or any other non-talk page), a link to the corresponding talk page appears on the "Talk" tab at the top of the page. (The mobile version has a button at the bottom for logged-in users, while apps may have no link.) Click this tab to switch to the talk page; you can then view the talk page and its history, and edit it if you want to add a question or comment.
If the "Talk" link is red, it means no talk page has been started yet. Click the red link to begin a talk page for that article and follow the instructions in Starting a new thread below. (It is also possible for a talk page to exist while the corresponding non-talk page is a red link; this often occurs in User space, when a user has received talk page messages but has not started a user page yet.)
To go back to the article page from its talk page, use the leftmost tab at the top of the page, labeled "article". For pages other than articles, this tab may say something different, like "user page" or "project page".
When you post a message on a talk page you should always sign and date your comment so other editors can follow the thread of the conversation. To do this easily, type four tildes (~~~~) at the end of your comment, or just click the signature button on the row of buttons above the edit box. Once you save the edit, this will be automatically converted into a user signature with a link to your user page, your user talk page, and the date and time that you save your edit. (You can change the form of your signature using your user preferences.)