You should also use the common ancestors filter, which utilises thrulines and other people's trees, you should be able to select common ancestors on your DNA page. But you do need to put in a good base tree in for it to work, say to all your eight great grandparents at least, using full names, birth dates and places preferably. You can then scroll down your match page and if you click the match you will get a match page which should show how you are connected on the left, it will show more information and a little basic tree if you click the names of the common ancestors. You can also click the shared matches tab on the match pages to see who you both connect to, and you can use that to start putting relatives into coloured coded groups either on each match page, or on the main DNA match list page.