Time to learn Unix commands.
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Open terminal. That is your home directly (the prompt will have ~ in it), if not sure, type cd <enter> that puts you back to home.
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ls -ahl
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This will list a bunch of stuff.
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You should see something like:
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lonney@office-mac1 ~ % ls -ahl ? ? ?
total 152
drwxr-x---+ 40 lonney ?staff ? 1.3K Oct 11 08:53 .
drwxr-xr-x ? 5 root ? ?admin ? 160B Jul 17 02:49 ..
drwxr-xr-x ?25 lonney ?staff ? 800B Oct ?5 15:18 .fldigi
drwxr-xr-x ?18 lonney ?staff ? 576B Oct ?1 08:01 .flrig
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Rename:
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lonney@office-mac1 ~ % mv .fldigi .fldigi.old
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Start Fldigi again.
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- Lonney