Digital sign pdf

Hi

i just read here The actual solution is to not use the "Fill & Sign" as someone else suggested.  You need to click on the “Certificates” button rather than the “Fill & Sign” button.  This brings up a new button called “Digitally Sign” and that permits the sig on a locked doc which has another sig already.

i have signed a document with digital id that other people have to sign,

so

does that mean I have to lock my signature when i sign? Or i leave it unlocked?

thanks