how do i add hydraulic fluid for convertible top?

you probably have a leak for sure , the pump has a screw about half way up the reservoir and you need zf grade oil from Mercedes Benz or factory recommended brand like Fuchs also a syringe with a long tube and fill it to line and operate it a few times and make sure the air is all out,no bubbles ,try to repair it soon as possible the pump will fail if to much air is getting in