Remove and remove from startup (couchpota etc)

I followed a few tutoriel, but can’t manage to remove couchpota and deluge web, each time I reboot the service is back on with the web interface.

any idea how to get rid if it and how to access the “start in boot” / startup item on ubuntu mate.

many thanks in advance

PS I removed from sudo nano /etc/rc.local

You can see Startup Applications by going to Control Centre > Personal > Startup Applications. Hope that helps.