To make reservations for titles, it is essential to be logged in (top right).

In the results of any search, the “Request” option will appear.

You also have the “Request” option, in case the search result offers several items:

Once you click on that button, a screen appears in which you must indicate the library where you want to collect the work, and click “Send request”:

The program will send the following message:
In your personal space, in the “My requests” section, you will have information about the status of the requests you have made.