After you log in to your FastPanel, open the Site Card of a website you wish to create a FTP account for. Now find an option named FTP Accounts:
On the right, you will have a button named New account:
After you click on it, a new page will open where you can enter a username and password for your new FTP account. You can generate a password by clicking on the word Generate, which we recommend. Below you can change the home folder for your FTP account and change its' permissions from Allow all to Read-only.
Click on Save and now you can see your new FTP account is active.
Whenever you wish, you can change details for that FTP account by clicking on the pencil or delete it by clicking on the trash can.