Adding text to end of filename?

How do I add text to the end of a file?

Say I have: 01-artist-trackname.flac
I would like: 01-artist-trackname-releaser.flac

You can use the Converter > Filename-Filename
Source Pattern: %1
Target Pattern: %1-releaser

I tried: Replace > Filename
Source Pattern: %1
Target Pattern: %1-releaser

It didn't work.

No wonder.
The function I referred to is Convert> Filename - Filename.

Sorry. I would like to add it to my Actions List. How can I do that?

Action Type: Format Value
Field: _FILENAME
Format String: %_filename%-releaser

Perfect! Thank you!