Lift the home button bracket starting from the left side.

Carefully pull it upwards toward the display, making sure not to damage the home button cable.

During reassembly, after installing the home button, you'll need to glue this bracket into place to secure it.

Scrape off as much of the old adhesive residue as you can, then clean it with acetone or high-concentration (90% or greater) isopropyl alcohol.

Secure the bracket with a high bond glue, superglue, or high-strength double-sided tape. Make sure the bracket is aligned correctly before allowing your adhesive to cure, or the home button will not click when pressed.

It may be necessary to use vise clamps to hold the home button bracket in place as the adhesive cures.