How do I replace the synthetic rattan weaving for this outdoor couch?

[angepak]

Hi, 

I have a 2.5 seater and a single arm chair that I would like to repair where the weaving has disintegrated. I have attached a photo. The frame is metal. I am not very handy so any advice for a fairly simple project would be appreciated. Otherwise suggestions on what to do with this furniture other than throwing it into landfill. 

Many Thanks,

Ange