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 this reading yet, so here's a mnemonic to help you:
You technically already know this reading! You know how people say いただきます? Well that's the same as this! You're humbly receiving your meal. So to humbly receive is いただく!
Thank you very much for your congratulations.