Crappy weed eater trimmer I got for $7 how to change the string on a model Twist-N-Edge TE-15

I bought this stupid weed eater for $7 but nobody could tell me how to change the nylon cord that cuts the grass, many websites tried, but all the directions I got were in fact wrong. Until one day I got a factory old timer that knew what the heck this thing was, and sent me an original manual.