The location of the 7 icons:
1) Outside starting area. Climb the ladder up, then jump on the guard-rail. You're now high enough to jump at the icon and trigger the text.
2) Entrance to the inside area, check around the corner to the left for the second icon.
3) After selecting the difficulty, take the path left which takes you up stairs. Once in the room with the rain, on the far-right is another icon.
4) The middle entrance to the main gallery (look for the signs) has a flower/bush either side of it. Above the left bush is another icon. You can jump up there using the rail behind it or you can jump down from above if you've worked how to start that puzzle.
5) There's a icon towards the start of the jump puzzle on the other side of the mini stairs you climb up
6) In the "no signal" room before the credits room, there's a icon just inside the room to the left as you walk in
7) In the hidden "event", once it's over you can climb up to the top of the right room and then follow the path to the next room. The final icon is there on the floor.
The list above is NOT the order they appear in the password. The order is just the simplest way of finding each letter with minimal backtracking. You still need to work out what word the letters spell. As mentioned in spoiler 1, if you struggle with this then use an online scrabble solver

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And if you want to know how to find the hidden "event", reveal the final spoiler below.