This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means "stand" so what's the verb version? It's also "to stand."

Don't confuse this with 立つ which also means "to stand." It's a different kind of "to stand." With this one, you're standing something up. As in, "I stood up the action figure" or "I will stand up the flag." You're doing the action of standing something up.

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:

You have to remember the た portion. In order to do that, think of yourself standing up a huge sign. On it, written in big words:
"ta ta (た)!"