Slider Arrow over Radio box-Radio Box will not be checked

Hello everyone
I make a slider multi step form so i have set up all it would be working with a single button with next step but i want that the costumer comes directly to the next slide if he clicks on a radio button.
I have overlaid the radio button with the link block (right arrow) so i come to the next slide but if i submit the mail is empty.So the radio buttons will not be checked.
Who as a solution for me i have to bring this project to a end so would be grate ful if anybody helps me here out!