bił yáʼátʼééh = he/she likes
bił here is a propositional pronoun that means "with him/her" or "in his/her company." When it is put with yáʼátʼééh (as a verb, this mean "is good, fine, agreeable"), it is the idiomatic way of expressing that someone likes something. A bit more literal translation would be "X is good with him."
To use this constructions with other pronouns, you have change the prefix accordingly:
shił yáʼátʼééh - I like
nihił yáʼátʼééh - we like
dił yáʼátʼééh - you (singular) likes