Step 1 :- on your left hand side you'll see menus, from that navigate to the pages menu
Step 2 :- Navigate to the page or search that page which you want to edit.
Step 3 :- Hover over that page which you want to edit & you'll see some options, in which click on edit with elementor
Step 4 :- now click on that element which you want to edit, the sidebar will change. for example if want to change title next to image we will click on that title
Step 5 :- similarly we can change the image if want by clicking on it
Step 6 :- After doing all the changes we wanted to do just click on update button