[B-Matt]

Create input dialog. When he click enter and strlen is equal to 0 you just send him message. Like this:

pawn Код:

#define DIALOG_BLA  1
ShowPlayerDialog(playerid,DIALOG_BLA, DIALOG_STYLE_INPUT, "Login", "Bla bla", "Login", "Cancel");

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
    if(dialogid == DIALOG_BLA)
    {
        if(strlen(inputtext) == 0) return SCM...
        //If strlen is more then 0 your code
        return 1;
    }
    return 0;
}