Calendar hit and miss

When i first upgraded to pro i struggled to get the calendar integration to work, someone in the forum pointed out that i needed to put the - ! to bring up the calendar menu, but i am still having some problems. it hardly ever seems to appear in my calendar so i must still be doing something wrong.
I notice from the other comments that other people are having problems with how long it takes to appear, but in my case it mostly does not appear at all.
could someone please help.