There is not much known in the US about breeding Big Eyes. Do you know which type of big eye you have (scientific name?) as there many types in the genus. Sorry if I am asking silly questions but here it goes? How old is are your frogs? They will need to reach sexual maturity before they will attempt to breed. You have more than one correct? Have you heard calling to guarantee you have at least one male and female? I do know your chances of success are better the larger breeding group you have.
If your frogs are old enough, you will need to cycle them for breeding, which usually means feeding them more than normal (as you do not feed them in the breeding chamber) and setting up a rain chamber of sorts to replicate their breeding season. An online search for breeding chambers should give you a nice selection of types used.
Also if you know the scientific name of your frog, search under that for breeding as most breeders do not use common names for amphibians.
Sorry if you know all this already!