Apple Airport Express and BT HomeHub


I have a couple of question - hope somebody can help!

1. Can I use the Airport Express to extend my wireless signal to parts of the house where the HomeHub signal is a bit weak?

2. How do I set this up? (instructions for dummies)

3. I've tried to set-up using the Airport utility software that came with the Airport Express, but only seem to be able to select for the AE to connect the HomeHub via ethernet.

It's all driving me crazy.