On your application screen you can add tags to the tiles (=applications). To do this, select one or more tiles and click the pound sign (#).
Please note that you have to click "add" first and then "save". This allows you to add multiple tags at once. Also, please be aware that the tags are case sensitive. For example: if a tile already has a tag "Test" you cannot add another "Test". You can, however, add a "test" or "TEST".
You can delete tags by clicking the small x next to it on the tile.
All tags are added to the "contact info" CSV-export.