HELP! Libraries are not recognized (schematic symbols)

That depends how they are added. The libs that are shipped with kicad use environment variables so these are easy to change by changing these variables.

If your personal libs do not use variables then yes you will need to change their path manually (the lib table is a simple text file so you can change it outside of kicad by use of a text editor)


At the very beginning of the linked article:

Again answered in the article