Descript's Tag feature allows you to label ranges of wordless media in the Script track. Tags provide a convenient way to assure that non-speech audio is labeled, which is essential for open and closed captions.
Tags can only be added to audio and video files that have been transcribed and placed in the main Timeline editor. If nothing happens after you select Add tag for range," try transcribing the file first. Please note that ranges cannot be placed on clips in the pinned track (above the timeline), or on multitrack Sequences.
In the event that you need to remove/disassociate a tag from a portion of your audio, switch to Correct Text mode by pressing Command + Option + E (MacOS) or Control + Alt + E (Windows), or Edit menu > Toggle Correct Text.
Highlight the range containing the tag by clicking into the script just before the tag and holding Shift + right arrow until the tag is selected in the timeline, then press Delete. After a moment you will see that the tag has been removed from that section of the timeline.
At this point, if there is some text that needs to be restored to the audio, you can now add it back in using Correct Text mode.