I have a pair of budgies in an aviary how do i breed them?

You need to get a nest box suitable for budgies first. Make sure that the budgies have a good healthy diet and are in good healthy. Then all you can do is leave it up to them. Just because you have budgies of both es doesn't mean they will breed. I have had budgies in my avairy for over 7 years and last year was the first year any laid eggs. She was a new bird and did sit but no babies.