Cannot access backend anymore

[YvesTh]

I was trying to make my header redirect to the actual website instead of magento home.
So i changed it in  Stores -> Configuration -> Base URL  To the actual site URL.

Now i am no longer able to access the backend anymore.

Is there any way to fix this? And get back into the backend? 
Or can you undo this change somehow?

[nuwinda]

Login to your database (phpmyadmin)

Look for core_config table_data table and change the  values for 

web/unsecure/base_url or web/secure/base_url path

Make sure you make changes to correct store