1) This is Prefooter widget area that displays Static block widget. If you check the static block that was used in this area you’ll see that it includes custom widget areas. So, to add the products go to Appearance > Widgets and add WC products widgets into Featured products custom widget area, sale products custom widget area etc. In case you want change the content completely and show some text instead of these widget areas then go to Static Blocks > edit prefooter static block and using VC backend editor change the content http://xstore.helpscoutdocs.com/article/47-static-blocks
2) Go to Pages > edit Front page > edit elements http://prntscr.com/gx9da3 and choose what products/posts you want to show there
3) See 2) item, edit the Products VC elements in every tab and choose the options you need.
4) Follow Revolution Slider documentation https://www.themepunch.com/faq/turn-autoplay-off-sliders/
5) Replace existing content of text widget by following <p style="color:#fff;">Για παραγγελίες ΟΝ LINE η καλέστε: 6989591110</p>
