Hello,
To change the logo and header go to Theme Options > Header builder > https://gyazo.com/8a63b067d2102534f91a5bf68483b6da
Header builder video tutorials https://www.youtube.com/playlist?list=PLMqMSqDgPNmDu3kYqh-SAsfUqutW3ohlG
To change the footer go to Static blocks > edit Footer static block using Elementor.
Besides, update Elementor Pro plugin to the latest version because you use out of date version of plugin.
Regards