How do I untie these ropes that I'm in

Hint 1 of 7:

I assume you mean after you find your father.

Hint 2 of 7:

It really helps if you've been to this room before.

Hint 3 of 7:

Have you played with the suit of armor?

Hint 4 of 7:

The axe falls, and it leaves a mark on the floor.

Hint 5 of 7:

Move the chairs (by pushing or pulling them) until you're by the mark.

Hint 6 of 7:

That is, until the space between the chairs is lined up with that mark.

Hint 7 of 7:

Then, have Indy pull the suit of armor.  Hopefully, you'll be freed.