Moving to a specific record on opening a form?

Hello to all,
By searching on this forum I found this old subject that feats my needs:
https://ask.libreoffice.org/t/how-can-i-convince-base-to-go-to-a-specific-record-on-opening-a-form/41411
However, I can’t make the code indicated by @EasyTrieve working.
I can’t understand how to pass each parameters to each functions.
Maybe @LSemmens could help me ?
Thanks a lot in advance,
Pascal