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" and this means to stand something up or to erect something.

Don't confuse this with 立つ. 立てる means that you're standing something up. As in, "I stood up the action figure" or "I will erect the flag." You're doing the action to something else.

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)!"