Try these links:
connect 2 routers
https://www.youtube.com/watch?v=kECJVD08Fi0
https://www.youtube.com/watch?v=J5QJb3O19zI
using old routers https://www.youtube.com/watch?v=v_wz0zQngnA
3 routers https://www.youtube.com/watch?v=LFdGsLofmds
more routers https://www.youtube.com/watch?v=LFdGsLofmds...