This is pickled melon.
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it should use the kun'yomi reading. You haven't learned this reading yet though, so here's a mnemonic to help you:
Bite into a melon and what do you taste? Uni reese's pieces (うり)! Did you know that? The next time you eat a melon see if you can taste the difference!