nextwe'll add the code to show the registration page link to any user who is not currently logged inbase html --snip-{if user is_authenticated %hello{user username }log out {else %register log in {endif %--snip-now users who are logged in see personalized greeting and logout link users not logged in see registration page link and login link try out the registration page by making several user accounts with different usernames in the next sectionwe'll restrict some of the pages so they're available only to registered usersand we'll make sure every topic belongs to specific user note the registration system we've set up allows anyone to make any number of accounts for learning log but some systems require users to confirm their identity by sending confirmation email the user must reply to by doing sothe system generates fewer spam accounts than the simple system we're using here howeverwhen you're learning to build appsit' perfectly appropriate to practice with simple user registration system like the one we're using try it yourse lf - blog accountsadd user authentication and registration system to the blog project you started in exercise - (page make sure logged-in users see their username somewhere on the screen and unregistered users see link to the registration page allowing users to own their data users should be able to enter data exclusive to themso we'll create system to figure out which data belongs to which userand then we'll restrict access to certain pages so users can work with only their own data in this sectionwe'll modify the topic model so every topic belongs to specific user this will also take care of entriesbecause every entry belongs to specific topic we'll start by restricting access to certain pages