Use a spudger to pry the antenna board off the earpiece speaker.

Remove the board.

Before securing the antenna board to the speaker, make sure the board is oriented so the antenna socket is along the same edge as the cable groove.

If your replacement speaker has adhesive pre-installed, remove the plastic liner and press the board into place to secure it with the adhesive.

If your replacement speaker doesn't have pre-installed adhesive, use thin double-sided tape such as Tesa Tape to secure the board to the speaker.