Can't Edit CiviContribute Pages after URL Change
For a domain change, look at the civicrm.settings.php file the 'CIVICRM_UF_BASEURL' is the field you are looking for.

For CiviCRM version 4.7.x this will be in wp-content/uploads/civicrm/
For CiviCRM versions 4.6.x and lower this will be in wp-content/plugins/civicrm/

You may also need to make changes for WP, but this is what you'll need to start with for CiviCRM.  In addition, the CIVICRM_UF_BASEURL setting must match the Site Address (URL) in the WP General Settings.

Update:
Ensure that CIVICRM_UF_BASEURL  reads as below:

define( 'CIVICRM_UF_BASEURL'      , 'http://sweetfields.org');