Can't move paths

I'm using a Macbook Air, and I can't work out how to modify the path arrows so they look neat. Can anyone help?

There is nothing in the documentation. The models in the examples all look nice, whereas everytime I add a path or covariance path, the program sticks them in anywhere and I can't move the end-points around to different parts of the observed or latent variable.

Please help!

Jay.