1. Once you generated the elements and downloaded them...
Haza-kun wrote:1. How can I use them 'cause I don't know skinning so...
2. Can I use it in osu!skinner?
in-game do CTRL+O -> Skin -> Open current skin folder
... then you paste the elements into the skin of your choice
also make sure you DON'T have scorebar-marker, and you have scorebar-ki, scorebar-kidanger and scorebar-kidanger2
2. No, you cannot, it is another person's 3rd party application. You can, however, of the osuskinner's export paste your scorebar there.
Also, don't post that skin on the skinning forum, it is not allowed