How do I loosen the Fllo harness? January 14, 2021 20:03 Updated While lifting up on harness adjuster tab, pull out on the shoulder harness straps. Related articles How do I adjust the Fllo's Shoulder Harness Straps? Video Manual (US) - Installing Fllo Rear-Facing Video Manual (US) - Installing Fllo Forward-Facing How do I loosen the Foonf harness? How do I check that my child is properly harnessed in the Fllo when forward facing? Comments 0 comments Article is closed for comments.