You can log in to UltiMaker Cura using your UltiMaker Account. If you forgot your password, you can easily perform a password reset. Learn more on this page:
I forgot my UltiMaker Account password
If you are encountering an issue with signing in to UltiMaker Cura such as an error message, please allow an exception to your Proxy (like Zscaler) network security application for 'account.ultimaker.com' to solve this.
For more information about this issue, look for the UltiMaker domains that need to be whitelisted in this article:
Network requirements