Hi Dominika,
I assume you meant the "bdl" function instead of "bld." You are correct that the functionality for creating connections to Bloomberg Data License has been moved to File Exchange. You can read more about this change in the release notes here - https://www.mathworks.com/help/datafeed/release-notes.html?searchHighlight=bdl.
Please go through this link - https://www.mathworks.com/help/datafeed/blp.html which discusses the 'blp' function, which creates a 'blp' object representing the Bloomberg Desktop connection. This function helps you to connect to various Bloomberg services.
I would also recommend you to go through this example which talks about how to connect to Bloomberg in a greater detail - https://www.mathworks.com/help/datafeed/connect-to-bloomberg.html.
