what about that the adress change all the time? if the address has changed in my wallet
could I still receive funds on the old one??
because the address has changed a lot of times by its own without I have change it
Short answer: yes.

Addresses are just a representation of the public key from a public/private key pair.  Wallets generate new key pairs for every transaction.  Every time you click "Receive", you generate a new key pair.  Your wallet manages these keys for you, so you don't have to think about them.  For best practice in privacy, it's best to always use a new address (key pair) every time you receive payment.  That is why it has changed without you telling it to.  You can always re-use one, but there's really no reason for it.