You need semi ripe cuttings for hydrangea, taken in summer. I'd dip them in rooting hormone, pop them into pots with a mix of seed and cutting compost and vermiculite or perlite, and then put the pots in a plastic covered box outside, out of the sun, or in a cold frame.

I'll try that tomorrow, can I ask why covered at this time of year?

to prevent moisture loss - you can put sticks in the pots and then pop them inside individual plastic bags instead if its easier, but the plastic must not touch the leaves.

ok thank you