To add pin headers simply search for "pin header"!!!
Click Add and then write "pin header"
Something that disturbed me was finding the phoenix connectors, just write "phoenix" (I didn't really know the traslation of the world in english, I'm Greek!!!)
Finally, if looking for PC connectors like the serial or parallel type "sub-d"... It made me very nervous looking for them!!! So if ya need any help... let me know!!! I had a very hard time learning it all alone... So I know how it is....