sorry if this dose not usefull for you because i used google translate.

so first you have to do...(like imagine)
**before**
[![enter image description here][1]][1]


**after**
[![enter image description here][2]][2]
**second**
[![enter image description here][3]][3]


and i hope this help you.
  [1]: https://i.sstatic.net/liScf.jpg
  [2]: https://i.sstatic.net/nV9ox.png
  [3]: https://i.sstatic.net/Zv0ZG.png