Did something seize up and break the belt? You might need to deal with a bigger problem before you just loosen up the tensioner bolt and put a new belt on. Loosen up the tensioner bolt, place the correct belt on, making sure you run it correctly around all the pulleys, then borrow (at OReillys or a similar) the long handled tool, you use to put tension back on the whole pulley system and tighten down the tension bolt. If it was me, I'd go to YouTube to look at a couple of DIY videos on the subject.
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Did something seize up and break the belt? You might need to deal with a bigger problem before you just loosen up the tensioner bolt and put a new belt on. Loosen up the tensioner bolt, place the correct belt on, making sure you run it correctly around all the pulleys, then borrow (at OReillys or a similar) the long handled tool, you use to put tension back on the whole pulley system and tighten down the tension bolt. If it was me, I'd go to YouTube to look at a couple of DIY videos on the subject.