The files can be loaded by dragging and dropping them on the screen or importing the audio. Both above and below the timeline with the audio you'll see a series of tools that let you make changes to the length, deleting parts you don't need or adding effects, including to a specific selection only.
The metadata can also be freely added or changed. In addition, a recording can be made directly with this program and the pertinent changes made post hoc.
Simple MP3 Cutter Joiner Editor has a large array of features that allow a file to be edited without wasting time learning to use the program, with everything clearly visible and accessible.