You cannot use the Knowledgebase Search feature of the 4D website to search for Tech Tips by ID (the IDs are listed in search results).
To locate a Tech Tip by ID, first click on any Tech Tip to open the page to it, e.g.:
Notice the 5 digit number at the end of the URL. This is the Tech Tip's ID. To view a different Tech Tip by ID, simply delete the ID from the URL and enter the desired Tech Tip's ID.
Note that, as of this posting, the Tech Tip IDs can be 4 or 5 numbers long.