Unable to delete audio sections

I am not able to delete an audio clip while using Audacity 2.0.3. I basically want the first 1:45 cut out, but when I select the section to be deleted and press the ‘delete’ key, nothing happens. Is there another way I can delete the desired section? Thanks

You can use “Edit > Remove Audio or Labels > Delete”.
If that option is greyed out, then either you don’t have a selection, or you have “paused” playback rather than “stopped” playback. Audacity must be in “stop” mode.