Error On trigger while adding a date

Question

This is my trigger i want to add 15 dates to issue date,while running a trigger its showing error,
try to solve that trigger
create or replace
TRIGGER ISSUE_BOOK_TRI
BEFORE
INSERT ON issue_book FOR EACH ROW
DECLARE
CURSOR a IS
SELECT join_date FROM member_book;
p_join_date DATE;
BEGIN
OPEN a;
FETCH a INTO p_join_date;
IF p_join_date> :new.issue_date THEN
RAISE_APPLICATION_ERROR (-20322,'You may Issue book only after joining');
elsif
:new.return_date := :new.issue_date+15;
end if;
CLOSE a;
END;
Error(15,22): PLS-00103: Encountered the symbol "=" when expecting one of the following: . ( * @ % & = - + < / > at in is mod remainder not rem then <an exponent (**)> <> or != or ~= >= <= <> and or like like2 like4 likec between || indicator multiset member submultiset
Error(16,5): PLS-00103: Encountered the symbol "END" when expecting one of the following: begin function pragma procedure subtype type <an identifier> <a double-quoted delimited-identifier> current cursor delete exists prior

Answer 1

/* Formatted on 2012/04/25 14:22 (Formatter Plus v4.8.8) */
CREATE OR REPLACE TRIGGER issue_book_tri
  BEFORE INSERT
  ON issue_book
  FOR EACH ROW
DECLARE
  CURSOR a
  IS
    SELECT join_date
      FROM member_book;
  p_join_date   DATE;
BEGIN
  OPEN a;
  FETCH a
   INTO p_join_date;
  IF p_join_date > :NEW.issue_date
  THEN
    raise_application_error (-20322, 'You may Issue book only after joining');
  ELSIF 1 = 1 -- uuuuuu miss the condition here
  THEN
    :NEW.return_date := :NEW.issue_date + 15;
  END IF;
  CLOSE a;
END;