Not sure on your specific top brand, but on Robbins tops those straps attach to #3 & #4 bow, then the long portion goes on one of the rain rail studs, either 6/5 or 4/7 on the below diagram. The #4 bow is (close to) where it should be. See here.
***Note these are for reference only, as I believe they are from two different tops I just found them with a google image search. Tops can can be different between style/brand. However should give you an idea of what to do with the straps. If you can't find which stud for your specific top, you might have to take your best guess and/or try a couple studs.
The tensioners are riveted to the front bow at some place I can't remember off the top of my head. Looks like those could be broken, you can get a set off of a busted top frame or at rosenthal mazda. There's a ton of photos and diagrams on Miata.net from installs of various brands and I'm sure William or Steven can chime in in a bit with more specifics since they do these tops all day, but i've done about 3 of them.