hi,
When you press F2, you should see 'CDlogic' listed in the window that pops up.
Double Left click it, a window should appear with all the CD devices listed.
Find the CD40106B in the listing [ note the numbers are not sequential]
Left click and OK, place the symbol on your circuit.
Type in .include cd4000.lib on your circuit.
This should now give you the ability to run the sim, when the circuit is complete.
Lets know what happens, if you wish post the asc file thats giving the problem