byoo-SEH-fuh-luss
Here's a breakdown:
* byoo: like the "boo" in "boo-hoo"
* SEH: like the "say" in "say"
* fuh: like the "fu" in "fun"
* luss: like the "lus" in "luss"
Remember to emphasize the first syllable ("byoo") and the second syllable ("SEH").