Tagging all is an option available via 'Bulk Actions' in the Directory, allowing you to Tag all records that are currently listed for Businesses, People, Activities and Tasks.

The best way to utilise this is through filtering. Once you have applied a filter to view the records you wish to see, you can add the Tag to the filtered records.

It will then ask you to type in the Tag name. You can use existing Tags or create brand-new Tags.
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Once the Tag has been added, all the records that were in the list will now be Tagged with this Tag. If you have created a brand new Tag this will be added to the Tag list so you can use this Tag for any future new records.