To change file/folder permissions using FileZilla, you can follow these steps:

Step 1: Connect to the FTP server: Open FileZilla and connect to the FTP server where the file or folder is located. Enter the FTP server details (server address, username, password, port number if different from the default) in the FileZilla's connection settings and establish a connection.

Step 2: Locate the file/folder: Once connected to the FTP server, navigate to the directory or folder that contains the file or folder whose permissions you want to change.

Step 3: Select the file/folder: In the remote server side of FileZilla (usually displayed on the right side), select the file or folder by clicking on it. If you want to select multiple files or folders, you can use the Ctrl or Shift keys while clicking.

Step 4: Change file/folder permissions: Right-click on the selected file or folder, and from the context menu, choose "File permissions" or "Directory permissions" (depending on whether you selected a file or folder). This will open the "File permissions" or "Directory permissions" dialog box.

Step 5: Adjust the permissions: In the "File permissions" or "Directory permissions" dialog box, you can modify the permissions for the selected file or folder by checking/unchecking the checkboxes for "Read," "Write," and "Execute" permissions for Owner, Group, and Public. Alternatively, you can directly enter the numeric value of the permissions in the "Numeric value" field.

Step 6: Apply the changes: After adjusting the permissions as desired, click on the "OK" button in the "File permissions" or "Directory permissions" dialog box to apply the changes.

Step 7: Verify the permissions: You can check the updated permissions for the file or folder in the FileZilla interface. The permissions may be displayed as a string of characters (e.g., rwxr-xr-x) or as numeric values (e.g., 755).

By changing the file/folder permissions using FileZilla, you can control the level of access and permissions for different users or groups on the FTP server. Please note that the ability to change file/folder permissions may depend on your FTP server's configuration and the permissions granted to your FTP account.