  We explicitly write down the Eisenstein elements inside the space of modular
symbols for Eisenstein series with integer coefficients for the congruence
subgroups {\Gamma}_0 (pq) with p and q distinct odd primes, giving an answer to
a question of Merel in these cases. We also compute the winding elements
explicitly for these congruence subgroups. Our results are explicit versions of
the Manin-Drinfeld Theorem.
