Customize "Frontend Submissions" to work properly

I already setup "Frontend Submissions" and a compatible theme. All I need now is just to make sure that it works properly as it should be. For now, I found some minor things to adjust, such as... - Login & register pages, make them redirect to homepage - Fix a problem on product uploading page. There is this error "An error occurred in the upload. Please try again later." - Test commission splitting system to make it work properly. There is already a commission plugin. All you need to do is just try to signup a new user as vendor then test if product selling and commission splitting system works properly as it should be. - Make the main landing photo to be fullscreen, fits on any monitors, 1-single-roll-down of scroll-button to see next page (products). - Testing, try website as a seller (to sell product) and try as a buyer (to buy product). To see if everything works perfectly as it should be. Everything supposed to work correctly because they're completed products. You just have to make it works together properly. There might be more small adjustments to ask for your help more (if i found more problems). All i needed is just to make it work properly and be 100% ready to work correctly for all new users.