To set up a connection to Talend Administration Center from Talend Studio, do the following:
Launch Talend Studio.
In the Talend Studio login window, click the [...] button to define a new connection.
In the [Connections] window that opens, click the [+] button to create a new connection.
Set the Repository type as Remote and enter a Name and Description for the connection, the E-mail and Password for the user you created in Talend Administration Center, and the URL for Talend Administration Center (for example, http://localhost:8080/org.talend.administrator but, depending on your configuration, you may have to replace <localhost> with the server IP address) in the Web-app Url field.
Be careful not to use an existing local workspace. If needed, you can create another folder in the Talend Studio alongside the default workspace folder.
You can now select the newly created connection in the Talend Studio login window to connect to a collaborative project.