Just enter the name or a part of it in the big search bar. Don't use wildcards such as *.
As you type, suggested results are shown in the drop-down menu.
By clicking on "Search" to start the real-time query.
If the company you are looking for is not in the drop-down, it may be because special characters are included in the name. Remove them and try again. In some cases, it can help to search for the company on Google by adding “kompany” to it (for example: XY GmbH kompany).