If you join the clan you will have that degree for activate boster credits + xp + arty skirmishes - but don't activate bosters above level 10 - those are activated by the clan boss under special conditions at tier 10. The bosters are activated from the settings section top right clan button then press the strong button and there are those pumpkins down.
Daca intri in clan vei avea acel grad ptr. activare bostere credits +
xp + arty skirmishes - dar sa nu activezi bostere peste nivel 10 -
acelea se activeaza de catre seful de clan in conditii speciale la tier
10. Bosterele se activeaza din sectiune setari sus dreapta buton clan
apoi se apasa buton fort si acolo sunt acele bostere jos. - comandanti unitate - activare credite - credits.