You can get an invitation in two ways.
First way: Receiving an invitation from the company
The company can invite you to take a take-home assessment. In this case, you will receive an e-mail from Codebie.
Please click on the "Take the task" button and fill in your information to accept the invitation and you'll see the git credentials.
Second way: Sending email from a public task
Companies can make their tasks public. That means, if you have the task link, you can invite yourself to this task. On the public task page, please type your e-mail and press the submit button. You'll get an email that includes the link for accepting the invitation.