1) To change the mobile menu edit mobile using header builder and edit the mobile menu element. Choose there menu you want to display for the mobile https://prnt.sc/1urmlne If I edit your header I see my changes.
2) I see slider on the mobile https://prnt.sc/1uro4hp But your images are big and not optimized. They are loading slow, so use https://tinypng.com/ to optimize images
Also, use Revolution slider responsive settings to align layers for the mobile devices https://prnt.sc/1urp6u4
