Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
I am going to obey you. I think your order is a bit of shit が (したが), I'll do it and obey you.
(Little side note, did you know が in the middle of a sentence can mean "but" in Japanese? Think of it as that meaning here.)
What do you think what would happen if I didn’t obey his orders?