How do I change or add tag/tags that a filter should be based on?
To change or add a tag on which a filter should be based, start by entering the desired filter. You do this via the menu and then tags and filters, then filter.
You will be presented with the existing filters on your account. Click on the filter you want to correct, which will lead you to this view:
At the field in the middle where it says "based on/Based on" you will see that it shows what the filter is currently based on. To add, remove, or correct the tags here, you can place the mouse cursor next to in this case, the "new customer" tag, and start typing in a new tag:
Then click the "Save" button on the top left to sync the filter.