How do you see your score in a tournament

First, you need to view the tournament listing, which lists active and pending tournaments.

If your tournament is active, you will be able to see your score - Example

If your tournament is still waiting for more players, you will not be able to see scores because scoring has not yet begun - Example

The tournament you're asking about is currently waiting for more players, so it hasn't even started, hence the reason you can't see your score.
When it starts, matches and scoring will begin.