分かったら

once you understand

→ 分かる

分かっ understand; get + たら Conditional (“if/when”)

verb · informal Rare #42,198

once you understand 分かったら means “if/once you understand”; it introduces what to do next.

JA: 分かったら返事をしろ。

EN: Once you understand, reply.

Conjugation of 分かる

Conditional

If you understand, get out of here immediately.

— 荒野の用心棒 (1964)

Once you understand, get moving already!!

— Pompo the Cinephile (2021)

If you understand, respond.

— es［エス］ (2001)

Now that you understand, kindly get lost.

— 最強のふたり (2011)