how do you put transmission fluid in a volvo s90 with automatic transmission

You can use a small hose with a funnel on top of it, then pull the dipstick, and connect the hose, then just pour the oil slowly, while the engine running, disconnect the hose, then put the dipstick back in, to check the oil level, if it still low on oil, repeat the process, or you can just bring it to the workshop, and change the oil, with an automatic transmission fluid changer.

since it is so far down and up against the firewall i used a piece of hose with a funnel