--Liner is in two "halves". Each half has a short edge (top) and a long edge (bottom).

Start with one half and begin tying the laces at the top edge into the clothesline cord guy loops, beginning above one tipi door.

Tie into the guy loops all the way around to above the opposite door.

Next, tie the lower laces on that half liner (near, but not at, the bottom edge) into the laces you'll find inside the tipi.  They too, are near but not at, the bottom edge of the tipi canopy.
You can control how tautly you install the liner by how snugly you tie between the top tie-offs and these lower tie-offs.

Install the other half of the liner the same way.  You will have two tie-offs above the tipi doors.   The controls at the doors allow you to shut or leave open the liner for narrow or wide tipi door openings.  

Living in your tipi a while will bring everything into focus for the way YOU want to configure your portable Home.  The mosquito netting is independent of the liner.   You may leave the liner installed semi-permanently if you like.

The stuff sack for your tipi will accomodate the combination of tipi/liner.