Will someone please explain it to me, i.e. where to put the ribbons, etc.
You will figure out how to use the ribbons over time, okay? There is more than one way to use them, depending on your preferences and expertise.
I’m assuming you have a typical missal, one that has the Order of Mass in the middle of the book, the Proper of Seasons (a.k.a. Proper of Time) preceding it, the Proper of Saints following it. The reason for this is purely physical: it’s the most natural place for a book to open and it reduces wear and tear on the spine. In normal use, you will have the book open in the middle for the stuff that is the same for every Mass no matter what the day, and then you will be flipping back and forth to either the Proper of Seasons or the Proper of Saints for the stuff that is specific to whatever particular holiday or saint’s day it is.
Put the first ribbon at the 16th Sunday After Pentecost, and then next week move it to the 17 SAP. This will be your marker for the Proper of Seasons and for nothing else, so that you can flip back and forth to the specific stuff for that holiday or Sunday.
Put the second ribbon at the Order of Mass. This will be your placeholder for the Order of Mass and for nothing else, so you can come back to your place in the Mass after taking detours to the specific stuff from the Proper of Seasons or Proper of Saints.
Put the third ribbon at August 26, St Zephyrinus, because that’s today. Tomorrow move it to August 27, St Joseph Calasanctius (Calasanz). This will be your marker for the Proper of Saints and for nothing else, so that you can flip back and forth to the specific stuff for that day’s saint.
Put the fourth and fifth ribbons at prayers you like to say. For example I have one at Thanksgiving After Mass, which in my missal is part of a collection of various prayers and devotions that have been put after the Proper of Saints (although some missals put this stuff right after after the Order of Mass). The fifth I put at the Examination of Conscience for confession so I don’t have to fumble with it while I’m in line.
Now a note for today’s Mass, St Zephyrinus. The specifics for his day are the standard set for most saints who were popes, the Common Of One Or Several Holy Popes “Si Diligis Me”, which is found at the start of the Proper of Saints. So, pull Ribbon ***5 ***out of the Examination of Conscience since you won’t need it during Mass, and just for this Mass put it in the Common of Popes. Leave Ribbon 3 at St Z, because after mass you will be moving it to St J C for tomorrow.
Trivia: there are usually 5 ribbons, one for each liturgical color! This by coincidence is the most useful number of ribbons for a missal.