If you can no longer connect to the private network after changing the password, these are the steps so that you can connect again.
First you have to go to settings on your phone and click on wifi there
Click on the name of the network you want to connect to and then click on 'forgot network’
Now you can reconnect by entering the new password.
After you have forgotten the network, you must reconnect so that the password is requested for the new connection. Now you can enter the custom password and you will connect to the network.