After you login to Family Finder (an autosomal DNA kit from FamilyTreeDNA.com, click on matches and you will see this below.
Enter the surname you are researching. Be sure to try different versions for the most or best results. Google the surname first; to find out the old versions, alternate versions and the modern versions of that surname. Google: Surname...and the surname you are researching.
Click the little square box next to the people who have listed that surname in their tree.
Click on the chromosome browser button and it will open up in a new tab and show you where you match with everyone on chromosomes.