First you go to the first page of your previous thread, and then you select and copy (contol + c) the full URL in the address box at the top of the window.
Then you go to the post in your new thread and after putting the cursor at the point you want the link to appear, you click on the Instant UBB Code -"URL" underneath the posting box. It will open up a window at top left, where you paste (control + v) in the URL address you copied earlier. Then you click on the OK button and another window opens where you type in the title of the thread ("Making Progress" for eg) then click on OK again and voilà it is done!
Why not summarise a little more of your situation directly on this thread? You may attract more responses if people don't have to work too hard!
Livnlearn
"The unexamined life is not worth living" - Socrates