Activated abilities of creatures can't be activated.
10/4/2004 Cursed Totem does not prevent creature cards which are not on the battlefield from having their abilities activated.
10/4/2004 Cursed Totem can prevent mana abilities from being activated.
6/8/2016 Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.