Catalogues allow you to sort and make activities available in the Find Learning catalogue so that users can locate and register onto them within the Unicorn LMS.
The Catalogues tab is accessed by going into the administration area of an activity (see find content in Content Manager or view an individual event if you're unsure how to do this). You will find the tab on the left-hand side.
Activities won't show in your Catalogue(s) for your users to locate them in Find Learning until you publish it. You will therefore need to use the Catalogues tab when creating or editing an activity to allocate it to the relevant catalogue and section.
The publish an activity to a catalogue guide will show you how to do this in detail.
To summarise, however, when you click on the Catalogues tab, you will be presented with a list of the catalogue(s) available, such as Entire Organisation shown below.
Please note that you might have requested that a catalogue should only be available only to certain groups of users, or set up as a read-only catalogue where self-registration has been deactivated. To set up further catalogues, please contact Unicorn Help.
Your LMS may vary from the screenshot below however there will be at least two levels within any catalogue structure as demonstrated below. 
If you want to use the catalogue structure options, you can select a catalogue in the Library. In this example, we have chosen Banking.
If you have a CPD scheme applied to your Unicorn LMS site, then you will also see a section where you can categorise the activity to the rules of your CPD scheme.
You can also make selections using the optional library tags towards the bottom of the page to further categorise the activity. These will enable the user to filter the activities by the categories that you have created. In this example, we have chosen Reading.
Please remember to click on Save before navigating away from the page to save any of the changes you have made.