Welcome there,
If you have a question about a specific challenge as it relates to your written code for that challenge, just click the Ask for Help button located on the challenge. It will create a new topic with all code you have written and include a link to the challenge also. You will still be able to ask any questions in the post before submitting it to the forum.
We cannot tell what is wrong without more information, as all challenges should be complete-able with the correct code. That being said, please remember that browser extensions can affect the tests, and we currently have an issue with Safari
Thank you.