Hey everyone! I have an almost 4 month old Yorkie named Bella

She's such a sweetheart. I'm having such a hard time trying to housebreak her though. We are trying to crate train...however my husband nor I really know how to-sad to say. Could anyone give me any pointers or any other ideas on how to train her? We have a fenced in yard and on pretty days I sometimes let her go outside with our other dog (they are best friends already) and play for a little while. She can be out there forever it seems and as soon as I let her back in...as soon as those little paws touch the floor she pees right in the kitchen. HELP!!!