It's say my stimulus return was rejected

What is the reject code?

Please retry electronically filing your stimulus registration later today.  This issue should be fixed.  

Make sure that you are using this link for your Stimulus Registration.  Here is where you can find where to file your Stimulus Registration on this link:

Why is the site still broken it’s been 5 days and I still can’t register 

The site is not broken.  You may need to print and mail.