The CDI instrument can tell you two things: if you’re left or right of the selected radial, and if you’re going to or from the VOR station.
To determine which radial you’re on, once you’ve tuned in the proper VOR, center the CDI with a FROM flag. Because remember, these radials emit from the station! Now read the number at the top of the compass rose (under the arrow).
This is the radial you are on.
If you were to fly that heading, it will take you further away from the station. Flying the reciprocal would take you to the station.
If you were to center the CDI with a TO flag, the selected course would tell you which course to fly to go towards the station, but not which radial you’re on.