You can't possibly miss the Cathedral Square ("Domplatz"), no matter where you're coming from. Now all you need to do is turn left into Residenzstrasse before the "Dombuchhandlung" bookstore. At Neupfarrplatz square, please turn right directly at the "ZARA" fashion store, and continue straight. Right before reaching the "Engel Apotheke" pharmacy, please turn right into Tändlergasse lane.