*help on linking threads*

Hi, thanks for reading and the ratings readers. Updates will be slow as i'm busy at the moment.
If any of you guys have had any success with linking threads within a single story please comment below as I haven't had much success with it. If i can figure it out it would help the story progress a lot easier and then I can start branching off and introducing more characters and "scenes".
Thanks :)
(I've looked at thread linking in the forums but still cannot understand it)