All of our hammocks come standard with an S-Hook connection on either end of the hammock. The ultralight carabiners that we sell either separately or as part of our Rope and Carabiner Bundle are a fantastic upgrade to these S-Hooks since they are lighter, stronger and multi-use.
No tying or untying of knots is required.
First, just create some slack in the cord where it's looped onto the S-Hook by pushing up on the cord towards/into the S-Hook (away from the hammock end).
Next, using the slack you've created, pull on the looped end of the cord until you've got enough slack to spread the loop open.
Then, just pull it back up and over the top of the S-Hook. That's it, you can now easily pull the S-Hook off and remove it.
You'll want to attach the carabiner using the same looped technique - feed the looped cord through the open center of the carabiner first and then spread the loop open while pulling it up and over the top of the clip. Pull the cord tight and it will create a secure connection. If you feel like you can't pull the cord tight enough, don't worry about it - the next time you use your hammock the looped connection will tighten itself when you get in.
Congrats on your upgrade!