What does it mean that it's not free standing? What do you have to do?

Tech Specs:

Material:

[Body] NEMO Osmo waterproof breathable; [Fly] 30D silnylon; [Floor] 30D PU nylon 

Freestanding:

Yes 

Poles:

None, 2 Airbeams 

Pole Material:

Sailcloth shell, PU bladder 

Doors:

1 

Clip / Sleeve:

Neither, hook-and-loop 

Floor Space:

112 x 64in (284 x 163cm), 40sq ft (3.7sq m) 

Interior Height:

42in (107cm) 

Vestibule Space:

14sq ft (1.3sq m) 

Packed Size:

14 x 7in (36 x 18cm) 

Ventilation:

Mesh walls, vents 

Weight:

4lb 13oz (2590g) 

Recommended Use:

3-Season backpacking 

Manufacturer Warranty:

Lifetime 

Country of Origin:

China