On Android, if you are not logged in, you will see a login button where the My Links list should be.  Click the login button.

On iOS (iPhone), when you click the My Links button, you will see a login button.  This takes you to a screen in which you can manually enter a confirmation code or go to the Zholink website.  In most cases, it's better to click the button to go to Zholink.com and register.

A browser will open up a page which will show you a list of icons which correspond to the trademarks of social networking services.  Click the icon for the service you want to login with.  You can review the website only for more details, but the steps may be slightly different. After you are logged in and have edited your profile, you may see a page or link to register your device.  A confirmation code is needed by the Zholink app to match your device with your Zholink profile.  When you see the confirmation code, use your browser's share button to share the page with Zholink.  By the way, this is a similar process in which you will send links to Zholink to save those links, but this page is special.  When you share the page containing the confirmation code with Zholink, the Zholink app will read the confirmation code and register your device.  After you register, you will see the My Links menu of links in the Zholink app, and you won't have to register again.

Read how to Share a link.