anyway...i just recently got my first board...6'8 nsp surf betty and i'm trying to attach my fins now but i have no idea how...i've never done it before so i need help...its probably stupid to say its like they don't fit because i suppose they have to be really tight...but if anyone knows how to do it then please help!!
It has 3 fins and what i think is 3 fin boxes...again i sound stupid but i don't know what it's called
HELP!!

Thanks!! xXx