I’ve done several of there before what you need is an 4” laminate elbow and maybe an extension all flat hard steel/aluminum laminate not corrugated duct extension the kind that come in flat sheets that you then fold yourself into a tube

then back up your dryer to see where the dryer vent opening mates with the outlet on the wall now if you’re lucky the 90degree elbow will be the perfect height to the wall vent and to the dryers vent if not then that’s where you will use the extension just cut out The appropriate size needed obviously and insert into elbow Try and remember this ; always insert the pipe inside the one above and not the other way around otherwise you will end up with a whistle and your dryer won’t dry properly Do not use screws you’ll have to use aluminum tape And when you get to the oval section you just squeeze it in to fit into the oval you can bend the lip until you get it in don’t worry as long as it’s in and taped well it will function correctly Once you have a solid connection and it’s taped thoroughly the job is done! Remember no screws and seal it as air tight as you can with the metal foil tape and pipe inside upstream pipe Always no corrugated vents no cheap foil vents only solid hard metal allowed or preferred