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Hi Sandy.
If you are using an ETX then you should be able to fit the webcam at the straight through position and an eyepiece at the top and use the flip mirror to swap between the two. You may need to get a T adapter for the webcam to do this. You won't be able to use a barlow in this situation unfortunately. As for increasing magnification, you can use a barlow to increase but it would have to go where your eyepiece would normally go. Or you can use a technique called eyepiece projection (if you have enough range of focus with your focuse knob).
There are a number of ways you can do this. The easiest way is if your scope has a T thread at the back. If it does then you can use a Meade meade variable extender (or similar eg Orion). Using the variable extender you can get a considerable range of magnifications depending on the distance the camera is from the eyepiece and the eyepiece you use. This is not the same as afocal imaging. Have a look at the diagram below to get the idea. Just swap the SLR with a webcam. Oh and you will need the webcam T adapter for this as well.
Hope this all made sense.
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