sage temple

To get in any of the temples, you need the power braclets (for the earth temple) and the iron boots (for the wind temple). You get them by first going to Mother & child Isle (Quadrant B2) to get the fire and ice arrows (if you haven't got them yet). Then you get the two items at either Fire mountain (quadrant C6 for the power bracelets) or Ice ring Isle (Quadrant F5 for the iron boots). After obtaining the item(s) you need you go to the temple and you play the song shown with your wind waker. Then you either go to Medli (for the earth temple) or makar (for the wind temple) and play the song that you learned (that goes with them). Then you go back to the temple (that goes with them) to complete the quest. Hope I helped.

If you have the Ballad of Gales, play it, Teleport to Mother & Child Isles and you'll get the Fire and Ice Arrows. Now go to Fire Mountain, use the Ice Arrows to freeze the lava coming from the Volcano, enter it and get the Power Bracelets - next, go to Ice Ring Isle and inside it you'll earn the Iron Boots. Following that, you need to go to Headstone Island, use your Power Bracelets to lift and throw the huge rock - inside you'll learn the Earth God's Lyric for the Earth Temple. You'll also need to go to Gale Isle, put on the Iron Boots to get inside and learn the Wind God's Aria for the Wind Temple. Lastly, go to Dragon Roost Island, find Medli at the top of the Island, play her the Earth God's Lyric and take her to the Earth Temple on Headstone Island. When you beat the Temple, go to Forest Haven, find Makar under the Waterfall, play him the Wind God's Aria and take him to the Wind Temple on Gale Isle.