you could try a few things:
Alias:
/nick1 /nick Lrietveld | /nickserv identify password
Script:
on *:notify: {
if ($nick == Lrietveld) && (Lrietveld == $me) { /nickserv identify password }
}
Manual entry - type out:
//nick Lrietveld | //nickserv identify password
(I forget if the pipe will work properly without using dual / marks or not when mnaully entering it into the editbox)