How do I loosen the Foonf harness? Clek January 14, 2021 21:20 Updated Follow While lifting up on harness adjuster tab, pull out on the shoulder harness straps. Related articles How do I adjust the Foonf's Shoulder Harness Straps? Video Manual (US) - Installing Foonf Rear-Facing How do I loosen the Liing harness? How do I loosen the Fllo harness? How do I check that my child is properly harnessed in the Foonf when forward facing? Comments 0 comments Article is closed for comments.