In order to make use of Tags in business or enterprise accounts, your administrator must have enabled tag filtering, and must have granted users sufficient permissions to tag items. To access tag settings, Open the Admin Console, click the gear in the upper-right corner to open Enterprise Settings, then click Content & Sharing.
If Admins restrict tag creation to Admins and co-admins, users will still see and be able to search/filter using tags, however they will be unable to add new tags to items.
Users can also enable or disable Tags in their personal account settings. To enable tags in your account, click your profile picture in the upper right (the default image is your initials), then click Account Settings.
In the Account tab, check the box marked Display Item Tags.
Tagging Items in Box
To tag an item:
Hover over the item you would like to tag, then click the ellipses (...) to open the More Options menu. Alternatively, you can right-click the item. Under More Actions, click Add or Edit Tags.
In the pop-up window, enter the tags you would like to add to this item. You can add multiple tags, seperated by a comma. Click Save once you are done.
Tags will be displayed below an item's name:
Note: Users must have Folder permission level of "Editor" or higher in order to create tags for a folder.
Searching and Filtering with Tags
To search for all files with a specific tag, simply click the tag below a file's name:
You can also filter by tags in any search by using the tags filter. Click the tags filter and enter the tag(s) you'd like to filter by.