By default, employees can NOT approve their own absence, availability or time cards.
If you want to change this:

1. Go to MANAGE MY BUSINESS
2. Go to MANAGE SECURITY GROUPS
3. Check these options ON for whichever group you want to assign permission too

   Can approve their own absence request
   Can decline their own absence requestCan approve their own availability request
   Can decline their own availability request

   Can approve their own time cards