Please can someone help - going round in circles on their website.

we have a long haul flight where were are economy Q and an internal Peru flight which is economy B.

Trying to sort out how much luggage without adding extra cost - but Lantam website seems to use promo, light, plus and top when saying what hold bags are free.

It's probably a basic question to most of you - but I just can't find which one equates to Q and B

thanks in advance
Sharon