If you do not like the angle if your seat, that is something you can easily adjust with a crescent wrench! There is a bolt with nuts on either end that clamps your seat to the seatpost. If you loosen the nuts on either side, you can adjust the angle before re-tightening the nuts.
Make sure to tighten both nuts really tight afterwards!
If your seatpost is equipped with a 'flip-up' lever, if it is now restricted due to the new angle, you can use the same crescent wrench to bend it out of the way so that the seat does not interfere with its function.