[Konstantinos]

It is quite simpler:

pawn Код:

if(sscanf(params, "s[65]", newpass)) return SendClientMessage(playerid, -1, "Use: /changepass [new password]");

becomes:

pawn Код:

if(isnull(params)) return SendClientMessage(playerid, -1, "Use: /changepass [new password]");

and you replace newpass with params.

You're welcome anyway.