How to edit symbol

This has probably already been well covered before , but I could not find an answer.
I recently migrated from 4 to 7 and a big change,!
I am trying to modify a footprint that has an error, namely it shows it as a single opto isolator when in fact the part number is in fact a dual IC.
When I go to edit it, it says “symbol graphics not editable”
I have tried different methods but no luck.

Sorry, that should be symbol not footprint.

Is it, that it is derived from an other symbol? Then you can’t edit it.
Derive it from a dual OC, or make a new one.

If you’re trying to edit the standard libraries, then forget it. They are read-only.
You need to copy the parts into a personal library to make changes. Check the FAQ.

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