How To enter a tournament?

Hello guys I need help! I entered a tournament for 10DEC however, I wasn't able to play in it.
How do you really play in tournaments?
If there's a youtube video tutorial for that please share it here so that I'll know what to do moving forward.
I have another tournament later 11 AM I would like to be able to play in that tournament.

I'm so sad I still can't figure out how to properly enter and play in the tournament.

I would appreciate any help and tips provided by the splinterlands community.

Thank you in advance.

Happy Playing everyone.