Type ADNUM in the command line and press enter or click on the ribbon button at the Add-ins tab.

Then, select a block with one or more attributes or select a text. A dialog box will appear.

If you select a block with attributes, choose the attribute tag to number in the pop-up. If you select a text, the pop-up list will be disabled for selecting a tag. For both cases, set the prefix, suffix, and starting number (prefix and suffix are optional). You can also select the option Numbering by a polyline.

After configuring the dialog box, press OK. If you selected the option Numbering by a polyline, select the polyline to be the reference to numbering and then select the objects. Otherwise, select the objects directly.

The app will filter the objects to modify as configured in the dialog. In the case of blocks, the app will modify only the blocks with the same name of the block you selected earlier numbering the attribute tag that you chose in the dialog box. In the case of texts, the app will number all texts in the selected objects as configured in the dialog box. If you selected the option Numbering by a polyline in the dialog box, the objects will be numbered following the direction of the selected polyline (starting with the object closest to the beginning of the polyline and so on).

The installer that was run when you downloaded this app/plugin from the Autodesk App Store will start installing the app/plugin. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart your Autodesk product to activate the app/plugin. To uninstall this plugin, exit the Autodesk product if you are currently running it, simply rerun the installer and select the "Uninstall" button. OR click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other system application.