Hungarian word order: https://hunlang.wordpress.com/category/word-order/
You can see the subject of a sentence (the person who's doing the thing) from the way the verb is conjugated, just like Spanish does it as well.
So in this sentence you have to find the verb and see for which person it's conjugated. The verb here is van/"to be", which is a bit irregular:
- én vagyok - I am
- te vagy - you (sing.) are
- ő van - he/she/it is
- mi vagyunk - we are
- ti vagytok - you (plur.) are
- ők vannak - they are
It may be difficult to find here, since vagy can also mean "or". But luckily that wouldn't make sense.