Glace tower switchs

[Jaquint]

I just need an explanation of all of them I think I have four but I have no idea where the last switch is.
1.i did the tapestry at the entrance to the area
2.i found the round switch on the geoung(do I need to drop something on it?)
3.i found the coffin ones because all of the coffins say their locked now.
Not sure about anything else help would be appreciated!