Tone board : external powering

Hi All,

I am investigating how to power the generic tone board from a good power supply directly on the card and keep up as bridge from RPI (not through Y cable which I already manage).

I am confused on what to do to feed power. I understand it is through pin 1 and 21 as presented in this thread, here and on examples on picture here.

However, here it is also mention that a ship needs to be to de-soldered.

What is the exact method? Need to de-solder? Actually what is the purpose of this ship.

Thanks fro you help.