Step 1. Creating new tag
You can check our Support Center on how to create new tags.

Step 2. Adding the "Tag" widget
After logging into your account, go to the "Layout"->" Widgets" page then drag and drop the "Tags" widget to either the left or the right sidebar. 
add tag widgetStep 3. Editing the tag
After dragging and dropping the "Tags" widget, click the icon at the right side of the widget and add the title for it.  Then click the "Save " button at the bottom right of this page.

tag widget title
Step 4. Viewing Site
Click the "View site" button at the upper left side of the account to see the widget you set.

tags at podcast site