Gently try both focusing by rotating the knurled finger wheel AND also try rotating the front cell of the lens.
Some of these are very hard to turn at the finger wheel, something to do with the grease. Supposedly can be corrected.
My first couple rolls seemed to have unpredictable focus. A lab said they looked like Holga or Diana stuff. They shouldn't, so that was pretty disappointing.
I have had some decently sharp stuff too, so I thought maybe I had some slipping in the finger wheel focus, but was told that just isn't possible. Even if it were, it would be very unlikely to ever be right again by random luck. It was probably just me doing DOF focussing, improperly.
Anyway, if you can focus by rotating the front cell (don't force it), the RF wheel may need help (I'm trying to avoid saying 'service').
I have one that the cell rotates on but doesn't change focus! I migh topen that one up becasue it doesn't work. The one that does I've learned - it probably WON'T if I open it up.
You CAN use it by rotating the cell and focussing thru the RF window that way. It's just one more fidgety awkward aspect of using one if it didn't have enough already.
Remember to open the bellows before advancing film. This gives you a better chance of film plane flatness. If you wind then unfold, the bellows can create suction and pull the film away from the focal plane.
Also be aware that it is normal for many Tessar-derived lenses, which this has, to need stopping down to at least f/11 for sharp corners.
Murray