Upgrade to Contact Form Pro version in order to enable this feature.
Please complete the following steps:
1) Go to the plugin settings page and open "Appearance" tab;
2) Find and enable "Style options" checkbox.
3) Find "Text color" section and make necessary changes in "Label text color" field.
4) Save changes.
This article related to Contact Form by BestWebSoft plugin
Additional resources: Contact Form - User Guide
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