Hello.
Without knowing exactly how you are struggling with the snare, i'm not sure i can help but i'll try.
Firstly i would set the strainer to the off position and loosen it completely.
Next would be to lock the little plastic tabs into the clamps on either side. You don't want the wire to be too tight at this point as the lever is set to off and it's going to be very difficult flip the lever up.
Then i would flip the lever up and see how the sound is, tightening the strainer until i get a sound i'm happy with for this stage.
If the snare wont go tight enough, loosen the turny thing (actual technical term
) flip the lever down and tighten the snare by pulling one or both of the plastic tabs towards the batter side of the drum, re-tighten the clamps and try again.
I hope this makes sense and isn't at all patronising. This turned out to be harder than i thought. I've never had to write instructions for anything now that i think about it.
When you get this far, take a look at this vid for an idea of how to get a balanced sound from your snare.
https://www.freedrumlessons.com/drum-lessons/snare-drum-tuning.phpI hope i have been of some help
Edit: I'm with Birch Boy on this one, clear heads on toms all the way. For me it's currently Remo, emperors on the batter side with diplomats for response.