[Me Too Shoes Adult Women] Saylor Mesh Flat Casual Shoe

This pair of flats that I ordered are darling very nicely made cute cute cute but they are too big for me and they slip off of my back of my heel and I need to return them along with another pair that I ordered a different shoes that were also too big so I but I don't know where I need to return these too. Can I take them right to Walmart store and return them please let me know how this is going to work for me. I'm 81 years old. I need to know soon I don't want to be charged for these shoes that I cannot wear, but I did re-order one pair and a 9 1/2 instead of a 10 and hopefully those fit correctly. Thank you very much. This pair of flats that I ordered are darling very nicely made cute cute cute but they are too big for me and they slip off of my back of my heel and I need to return them along with another pair that I ordered a different shoes that were also too big so I but I don't know where I need to return these too. Can I take them right to Walmart store and return them please let me know how this is going to work for me. I'm 81 years old. I need to know soon I don't want to be charged for these shoes that I cannot wear, but I did re-order one pair and a 9 1/2 instead of a 10 and hopefully those fit correctly. Thank you very much.