Selecting Other frames... from the v2 tag menu, or clicking on the Show button, opens a window similar to that shown below.

Down the left hand side is a list of the IDs of all the frames found in the tag, including the text frames normally edited in the main window. They are in the order downwards in which they are found in the tag (frames can be in any order). Clicking SELECT on any one will result in information about that frame being shown. The field at the top (designation) simply shows a short description of what the frame should contain. In this case a frame with an ID of TSSE, i.e. the settings, is being displayed. The content of the frame (if ID3TagEd can decode the data) is shown in the lower field. For some frames, the text No further information or something similar will be displayed because ID3TagEd cannot decode the data.
When the Frame content field is unshaded, as shown here, the text can be edited, although for the main frames, such as the settings, it is easier to do the editing in the main display. The edited frame is written back into the tag using the menu attached to this window. The text content can also be saved out using a standard Save as dialogue accessed from the menu.
If the Frame content field is greyed, then ID3TagEd cannot edit the data.
This second example shows the display of a COMM frame. The display changes to show two content frames, since a COMM frame may contain a short descriptor as well as the main comment.

This tag actually contains two COMM frames, seen in the frame ID listing at the left of the content frames. That shown is the first COMM frame, which will be the one shown in the main window, as can be seen in the v2 tag shown in the description of the v2 tag window.
There are certain other frames that have a descriptor or owner field as well as the content, e.g. WXXX. These will also be shown in this way.
Embedded images
One frame type that is treated differently is the APIC (embedded image). The standard allows either jpeg or png, the former being by far the most common. Clicking the APIC frame in the frame list will open the image information window, normally over the frame content field. Assuming ID3TagEd can decode the frame, the details will be filled in, as shown in the figure below.

If the image is a jpeg, then the Show image button will be available, and clicking this will display the image, this particular image being shown below. Note that, as the OS routines are used, this will only work for RISC OS versions of 3.6 and above.

ID3TagEd cannot currently display a png image, so the button will be greyed out in this case.
Clicking Menu over the image information window will show a small menu.

The image can be saved out via a standard Save as dialogue. This will work for jpeg and png images, and also for BMP, which sometimes turn up in tags originating in PC land.
The Add new... option is dealt with in the Frame full information menu description.