next to the library's name.
Justinmind Prototyper also lets you share widget libraries online with other people with a few clicks. This feature works together with your Justinmind account as the main platform to store and distribute your libraries across the Internet. Hence, an account is required to use this feature.
All the main functionalities related to shared libraries can be accessed through the menu that appears when you click on the gear next to the library's name.
The first step that must be performed in order to use any of the 'Shared widgets' functionalities, is to establish connection with your account. To connect to your account click on 'Sign In' at the top right corner of your screen and write your email and password.
If you see your picture or the shadow of a person, then you are already logged in.
Once you correctly signed into your account, all the libraries from your accounts will be retrieved from the server and shown in the 'My Libraries' tab in the 'Manage Widget Libraries' popup that comes up when you click on 
in the Widgets panel.
Use the 'Clear data' option you will find in File>Preferences>Your account if you want to clear all the retrieved shared libraries or you want to log into an account with a different user. Notice you can only synchronize Justinmind Prototyper with one Justinmind account. Logging with a different user will lead to a loss of all the local stored data related to the previous user.
Shared widget libraries can be created, used, modified or deleted through the different controls provided:
General controls: New library, commit all and update all.
Library controls: Modify, commit, update, discard changes and delete.