Insert the opening pick in the middle of the phone where you heated it. Slide it along the edge to cut through the adhesive.

This can be a bit tricky, don't use any sharp objects as you can damage the case. It's reccomended that you use a plastic wedge tool such as the one by iFixit, as it has a thicker ledge to prevent you from slicing too far in.

If it does not work, try heating the edge again.

Don't insert the opening pick too far. There are no flex cables in the way, but the wireless charging coil could be damaged.