Hello terence7556,
right will explain best I can.
You go in to the thread you wish to bookmark and in the top left hand corner of the first post, just below 'new topic' and 'post reply' should be a white cross on orange background with Bookmark next to it, click on to that.
Then a drop down menu will appear 'Bookmark and Share'
Chose the 'DIY DIYnot' logo, it will then open the diynot window for bookmarks and should now be saved.
Was that helpful?