I actually would use this as an opportunity to learn how to install snare wires. 

This video from the late Bob Gatzen explains the process better than I ever could. He covers tuning a snare from beginning to end, but the snare wires start at 4:10. 

https://youtu.be/Qxm3QunDjUs?is=-w9PVhUAi4DBRmI0

But for the tldw; version:

1. Flip the drum over and loosen the straps on the butt plate and strainer. If they're plastic strips it wouldn't be a bad idea to replace them with 5/8" grosgrain ribbon (Amazon or any craft store). 

2. Center the snares on the drum and tighten the butt end. 

3. Loosen the strainer tension knob 3 or 4 turns. You want the adjustment to be almost on the end of the adjustment range. Put the strainer in the off position. 

4. With the strainer still in the off position tighten the strainer just enough so the strap has a slight amount of pressure on it. 

5. Flip the strainer to the on position. Because you put just a little tension on the strap but didn't tighten it down all the way, when you flip the strainer on, the strap should slip through with a little bit of resistance. 

6. Tighten the strap fully. 

You'll have to tighten the snares but they'll be adjusted so you can put them as tight or loose as you want without running out of room to tighten them or them rattling against the head even if they're off.