A couple reasons that could be preventing you from submitting your score:
The deadline has passed.
Are you logged in with the correct account. (Tip: Your login is the same email you registered with, and where all communications have been sent to)
If you're on a team, are you the team captain?
Do you have multiple accounts and are you logged in the correct account? You can double check your email within the menu bar to ensure you're logged in with the same email address you used to register.
Still having issues, ping us in the chat, and give us the following details to help expedite resolution: Your name, email address, event name, and workout name.