Login error

Hi, i have changed my default page (https://links2u.net)to (https://links2u.net/?page_id=888)with a intro to be different from the directory i installed WordPress.
the problem is i can`t acees to Control Painel or make the login. The theme are not loaded (Pixel Theme) I change on Control Painel, General Settings, Blog address (URL). I already try a lots of diferent ways but with any success. How can i put my default page again (https://links2u.net)if i cant enter on CP.

Can anybody helpme please. Thanks