"The chown command changes the owner of the file specified by the File
parameter to the user specified by the Owner parameter. The value
of the Owner parameter can be a user ID or a login name found in the
/etc/passwd file. Optionally, a group can also be specified. The value
of the Group parameter can be a group ID or a group name found in
the /etc/group file.
Only the root user can change the owner of a file. You can change
the group of a file only if you are a root user or if you own the
file. If you own the file but are not a root user, you can change
the group only to a group of which you are a member."
man page for 'chown" command
parameter to the user specified by the Owner parameter. The value
of the Owner parameter can be a user ID or a login name found in the
/etc/passwd file. Optionally, a group can also be specified. The value
of the Group parameter can be a group ID or a group name found in
the /etc/group file.
Only the root user can change the owner of a file. You can change
the group of a file only if you are a root user or if you own the
file. If you own the file but are not a root user, you can change
the group only to a group of which you are a member."
man page for 'chown" command
or right click selected file?
then proceed to change permissions.