Step 1. Sign in to Facebook.
Step 2. In the "search" box at the top of the homepage.
Step 3. Enter the name of the group you want to leave. A list of results appear below as you type.
Step 4. Click the group name in the results. The Group page appears.
Step 5. Click the "Leave Group" button down on the left column.
Step 6. Click "Remove" when asked to confirm the deletion.