Sock help

i am trying the “seabury sock” by mary ann croisant, and need help with instructions…it saids bind off remaining 12 sts and cut yarn, TOP OF FOOT (this is what’s tricking)attach yarn and work the sts…ok, how do i reattach?

Just start knitting with the new yarn leaving a nice tail for working in and healing any little hole that may be there when you are finishing up.