When I put my candy in and got more lollipops, it will not let me get anything else. How do I do this and get more stuff from it?
There isn't a way to get more things from the Wishing Well. There are three set defaults:
"Multiply my candies by 5"
"Multiply my lollipops by 8"
"Give me lots of potions and scrolls"
From the Candy Box Wiki:
Take care ! You can use this bonus only once! When this is done, the well will advise you "I will grant you one wish! So choose carefully from the list below".
I think that pretty much sums it up. You get one wish, the well warns you to choose carefully because you only get one chance. There is no other way around this.