Adding thinlinc path to visudo

I installed the latest thinlinc server version to ubuntu v20.04 and need to update visudo to include thinlinc in path, as per instructions. However, I am unable to save edits using sudo visudo. man pages are no help. Any suggestions

I was able to finally update the visudo file to include thinlinc in the path. Then reinstalled program. Server is now running ol