Trevor Swizzle

How would I go about checking out this belt? It must be a CVT transmission. Here are some pictures

I know nothing about four wheelers/engines in general, I've had this thing for less than a year. It's an automatic transmission. You push it into high, low, neutral or reverse. When it's in reverse it's fine, but when going forward the tranny is slipping though. Neither my dad nor I know how transmissions work on these things. He says if it's like a chainsaw, then it won't cost that much to fix. Otherwise though, it'll cost tons. He kept telling me to look in the manual to find where the dipstick is for the transmission oil. I looked and looked and can't find anything about it. There is only one dipstick and that's for the engine oil, as far as I'm aware. Only thing in the book is talking about what recommended type of engine/transmission oil to use.