Apache 2 is set up and now want to add ftp

Hi,

Someone has set up Apache2 on a office PC running Ubuntu 20.4 and one WP site is available on the net and seems to be running okay.

whilst I have tracked down where the directories and sites are installed, I need to be able to get access to the via FTP so I cantry and set up more sites.

My web experience is only with WHM and CPanel on shared hosting and building sites.
I am a little okay with Linux and there is Zorin 16+ on the PC.

How can I set up FTP so I can access the sites...

Apache 2 is set up and now want to add ftp WordPress ...