mostly be remembering roughly where they were. Start in the right Forum by clicking the FORUMS button next to HOME above {the drop down list only shows some of the forums}.
If it was one of my own posts then instead I first select "My Posts" Which is at bottom right corner of the displayed messages then that has a search box at its top with which you can restrict the list to a handleable size. I use BACK and try different keywords until I get what I'm looking for.
Sometimes I remember there was a relevant photo so I click Photo Gallery {near the top just under the Elan logos} then slowly type one letter at a time into either "Filter by Topic Title" or "Filter by user name" (depending on what I remembered}. One you find the right picture you reach the topic by clicking the title of the picture.
Sometimes I use the LotusElan.net search box at top right, but alas that almost alway shows the oldest messages first and many of them are hard to read becaususe they were in email format from the old mailing list and are repeated. It is better than it used to be but it still takes tooo long to get to find stuff.
And the final method is to use Google instead of the internal search. A little known feature of Google is that you can restrict the search to a given domain name. Thus I start a fresh internet browser window and use it to go to
http://www.google.com then, for example, in its search box [..] I type
[ differential 3.55 site:lotuselan.net]
You still get a lot of results usually but they are easier to scan through.
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In all cases I makes extensive use of a right-button click and select "Open in a New Tab" so that if it is not what I wanted I merely close the new tab and my search list is still there to try the next one.
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Easy when you have, like me, been using computers since 1962 {54 years}