It's been a couple years, but one of the last things I tried to do was update an expired certificate on a web app. I never could get Apache to use the new certificate, I ended up just leaving the expired one out there.
To replace the certificate, I had to edit a config file....but I first I have to give myself read/write access to said config file, then use an ancient text editor and arrow keys to make the change I need.
@DXMacGuffin Um...
sudo chmod [the perms and file]
and
sudo [gui or terminal editor of your choice] /whatever/effing/file.conf
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