If you know the title...
You can see if the library has access to it by putting the title into the Quick Search box or by using the Journals A-Z list.
In Databases...
Some, but not all, databases allow you to limit your search to trade publications. For instance, in Business Source Complete before you hit the search button scroll down to the Search Options box. Then look for the Publication Type box under Limit Your Results. In Publication Type, scroll down until you find Trade Publication, click on it to add the limiter to your search.
In other databases, look to see if there's a filter for Publication Type or click on their help page.
For specific industries...
Try searching Google for a particular industry plus "trade journals" so: Education trade journals
