On the left side of the Les Glaciers des Bossons you will find a trail marker indicating La Jonction. This path will take you up to the first snack bar on this route: the Chalet du Glacier des Bossons. If the lift is operational you can also skip this first part of the hike by using the lift. You will not miss much and the lift ride is worth it. At the Chalet du Glacier des Bossons and thereafter there will be very clear signs for La Jonction so just keep following there. There are no other trails in other directions so getting lost is virtually impossible. After a number of switchbacks in the forest you will reach the second snack bar on this route: the Chalets des Pyramides. After this rest stop you will snake your up and the forest will turn into rocky paths. The views of Mont Blanc will get better and better. You will start noticing that the path gets rockier and that instead of signs you will have painted dots on the rocks to guide you. Assuming you are doing this without snow cover you should have no problem navigating your way up to the end point: La Jonction. After enjoying the view you can head back the same way. On your way down you will notice a sign that says "Sans Issue". I have used this path in the past to use a different route to get back to the start. You should not use this route though. Its state is unclear and its clearly not maintained and not meant to be part of this route. You can find a photo of this split in the road in the pictures section.