In sprintr.mendixcloud.com in your project: General settings → button ‘App Info’.
And if you need to rename your project’s ‘.mpr’, go to your project’s file folder, right click the .mpr-file → TortoiseSVN → Rename
Don’t know if it can help you but you can export the project.
Create a new application with the name you want
Import the application.
You will have a new name and a new link for the application.